diff --git a/doc/build/buildman.rst b/doc/build/buildman.rst
new file mode 120000
index 00000000000..beeaa425720
--- /dev/null
+++ b/doc/build/buildman.rst
@@ -0,0 +1 @@
+../../tools/buildman/buildman.rst
\ No newline at end of file
diff --git a/doc/build/index.rst b/doc/build/index.rst
index 69952f90d89..9a8105db21d 100644
--- a/doc/build/index.rst
+++ b/doc/build/index.rst
@@ -11,3 +11,4 @@ Build U-Boot
    clang
    docker
    tools
+   buildman
diff --git a/tools/buildman/README b/tools/buildman/README
deleted file mode 100644
index a8357a804b3..00000000000
--- a/tools/buildman/README
+++ /dev/null
@@ -1,1349 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0+
-# Copyright (c) 2013 The Chromium OS Authors.
-
-(Please read 'How to change from MAKEALL' if you are used to that tool)
-
-Quick-start
-===========
-
-If you just want to quickly set up buildman so you can build something (for
-example Raspberry Pi 2):
-
-   cd /path/to/u-boot
-   PATH=$PATH:`pwd`/tools/buildman
-   buildman --fetch-arch arm
-   buildman -k rpi_2
-   ls ../current/rpi_2
-   # u-boot.bin is the output image
-
-
-What is this?
-=============
-
-This tool handles building U-Boot to check that you have not broken it
-with your patch series. It can build each individual commit and report
-which boards fail on which commits, and which errors come up. It aims
-to make full use of multi-processor machines.
-
-A key feature of buildman is its output summary, which allows warnings,
-errors or image size increases in a particular commit or board to be
-quickly identified and the offending commit pinpointed. This can be a big
-help for anyone working with >10 patches at a time.
-
-
-Caveats
-=======
-
-Buildman can be stopped and restarted, in which case it will continue
-where it left off. This should happen cleanly and without side-effects.
-If not, it is a bug, for which a patch would be welcome.
-
-Buildman gets so tied up in its work that it can ignore the outside world.
-You may need to press Ctrl-C several times to quit it. Also it will print
-out various exceptions when stopped. You may have to kill it since the
-Ctrl-C handling is somewhat broken.
-
-
-Theory of Operation
-===================
-
-(please read this section in full twice or you will be perpetually confused)
-
-Buildman is a builder. It is not make, although it runs make. It does not
-produce any useful output on the terminal while building, except for
-progress information (but see -v below). All the output (errors, warnings and
-binaries if you ask for them) is stored in output directories, which you can
-look at from a separate 'buildman -s' instance while the build is progressing,
-or when it is finished.
-
-Buildman is designed to build entire git branches, i.e. muliple commits. It
-can be run repeatedly on the same branch after making changes to commits on
-that branch. In this case it will automatically rebuild commits which have
-changed (and remove its old results for that commit). It is possible to build
-a branch for one board, then later build it for another board. This adds to
-the output, so now you have results for two boards. If you want buildman to
-re-build a commit it has already built (e.g. because of a toolchain update),
-use the -f flag.
-
-Buildman produces a concise summary of which boards succeeded and failed.
-It shows which commit introduced which board failure using a simple
-red/green colour coding (with yellow/cyan for warnings). Full error
-information can be requested, in which case it is de-duped and displayed
-against the commit that introduced the error. An example workflow is below.
-
-Buildman stores image size information and can report changes in image size
-from commit to commit. An example of this is below.
-
-Buildman starts multiple threads, and each thread builds for one board at
-a time. A thread starts at the first commit, configures the source for your
-board and builds it. Then it checks out the next commit and does an
-incremental build (i.e. not using 'make xxx_defconfig' unless you use -C).
-Eventually the thread reaches the last commit and stops. If a commit causes
-an error or warning, buildman will try it again after reconfiguring (but see
--Q). Thus some commits may be built twice, with the first result silently
-discarded. Lots of errors and warnings will causes lots of reconfigures and your
-build will be very slow. This is because a file that produces just a warning
-would not normally be rebuilt in an incremental build. Once a thread finishes
-building all the commits for a board, it starts on the commits for another
-board.
-
-Buildman works in an entirely separate place from your U-Boot repository.
-It creates a separate working directory for each thread, and puts the
-output files in the working directory, organised by commit name and board
-name, in a two-level hierarchy (but see -P).
-
-Buildman is invoked in your U-Boot directory, the one with the .git
-directory. It clones this repository into a copy for each thread, and the
-threads do not affect the state of your git repository. Any checkouts done
-by the thread affect only the working directory for that thread.
-
-Buildman automatically selects the correct tool chain for each board. You
-must supply suitable tool chains (see --fetch-arch), but buildman takes care
-of selecting the right one.
-
-Buildman generally builds a branch (with the -b flag), and in this case
-builds the upstream commit as well, for comparison. So even if you have one
-commit in your branch, two commits will be built. Put all your commits in a
-branch, set the branch's upstream to a valid value, and all will be well.
-Otherwise buildman will perform random actions. Use -n to check what the
-random actions might be.
-
-Buildman effectively has two modes: without -s it builds, with -s it
-summarises the results of previous (or active) builds.
-
-If you just want to build the current source tree, leave off the -b flag.
-This will display results and errors as they happen. You can still look at
-them later using -se. Note that buildman will assume that the source has
-changed, and will build all specified boards in this case.
-
-Buildman is optimised for building many commits at once, for many boards.
-On multi-core machines, Buildman is fast because it uses most of the
-available CPU power. When it gets to the end, or if you are building just
-a few commits or boards, it will be pretty slow. As a tip, if you don't
-plan to use your machine for anything else, you can use -T to increase the
-number of threads beyond the default.
-
-
-Selecting which boards to build
-===============================
-
-Buildman lets you build all boards, or a subset. Specify the subset by passing
-command-line arguments that list the desired build target, architecture,
-CPU, board name, vendor, SoC or options. Multiple arguments are allowed. Each
-argument will be interpreted as a regular expression, so behaviour is a superset
-of exact or substring matching. Examples are:
-
-* 'tegra20'      All boards with a Tegra20 SoC
-* 'tegra'        All boards with any Tegra Soc (Tegra20, Tegra30, Tegra114...)
-* '^tegra[23]0$' All boards with either Tegra20 or Tegra30 SoC
-* 'powerpc'      All PowerPC boards
-
-While the default is to OR the terms together, you can also make use of
-the '&' operator to limit the selection:
-
-* 'freescale & arm sandbox'  All Freescale boards with ARM architecture,
-                             plus sandbox
-
-You can also use -x to specifically exclude some boards. For example:
-
-  buildman arm -x nvidia,freescale,.*ball$
-
-means to build all arm boards except nvidia, freescale and anything ending
-with 'ball'.
-
-For building specific boards you can use the --boards (or --bo) option, which
-takes a comma-separated list of board target names and be used multiple times
-on the command line:
-
-  buildman --boards sandbox,snow --boards
-
-It is convenient to use the -n option to see what will be built based on
-the subset given. Use -v as well to get an actual list of boards.
-
-Buildman does not store intermediate object files. It optionally copies
-the binary output into a directory when a build is successful (-k). Size
-information is always recorded. It needs a fair bit of disk space to work,
-typically 250MB per thread.
-
-
-Setting up
-==========
-
-1. Get the U-Boot source. You probably already have it, but if not these
-steps should get you started with a repo and some commits for testing.
-
-$ cd /path/to/u-boot
-$ git clone git://git.denx.de/u-boot.git .
-$ git checkout -b my-branch origin/master
-$ # Add some commits to the branch, reading for testing
-
-2. Create ~/.buildman to tell buildman where to find tool chains (see 'The
-.buildman file' later for details). As an example:
-
-# Buildman settings file
-
-[toolchain]
-root: /
-rest: /toolchains/*
-eldk: /opt/eldk-4.2
-arm: /opt/linaro/gcc-linaro-arm-linux-gnueabihf-4.8-2013.08_linux
-aarch64: /opt/linaro/gcc-linaro-aarch64-none-elf-4.8-2013.10_linux
-
-[toolchain-alias]
-x86: i386
-blackfin: bfin
-openrisc: or1k
-
-
-This selects the available toolchain paths. Add the base directory for
-each of your toolchains here. Buildman will search inside these directories
-and also in any '/usr' and '/usr/bin' subdirectories.
-
-Make sure the tags (here root: rest: and eldk:) are unique.
-
-The toolchain-alias section indicates that the i386 toolchain should be used
-to build x86 commits.
-
-Note that you can also specific exactly toolchain prefixes if you like:
-
-[toolchain-prefix]
-arm: /opt/arm-eabi-4.6/bin/arm-eabi-
-
-or even:
-
-[toolchain-prefix]
-arm: /opt/arm-eabi-4.6/bin/arm-eabi-gcc
-
-This tells buildman that you want to use this exact toolchain for the arm
-architecture. This will override any toolchains found by searching using the
-[toolchain] settings.
-
-Since the toolchain prefix is an explicit request, buildman will report an
-error if a toolchain is not found with that prefix. The current PATH will be
-searched, so it is possible to use:
-
-[toolchain-prefix]
-arm: arm-none-eabi-
-
-and buildman will find arm-none-eabi-gcc in /usr/bin if you have it installed.
-
-[toolchain-wrapper]
-wrapper: ccache
-
-This tells buildman to use a compiler wrapper in front of CROSS_COMPILE. In
-this example, ccache. It doesn't affect the toolchain scan. The wrapper is
-added when CROSS_COMPILE environtal variable is set. The name in this
-section is ignored. If more than one line is provided, only the last one
-is taken.
-
-3. Make sure you have the require Python pre-requisites
-
-Buildman uses multiprocessing, Queue, shutil, StringIO, ConfigParser and
-urllib2. These should normally be available, but if you get an error like
-this then you will need to obtain those modules:
-
-    ImportError: No module named multiprocessing
-
-
-4. Check the available toolchains
-
-Run this check to make sure that you have a toolchain for every architecture.
-
-$ ./tools/buildman/buildman --list-tool-chains
-Scanning for tool chains
-   - scanning prefix '/opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-'
-Tool chain test:  OK, arch='x86', priority 1
-   - scanning prefix '/opt/arm-eabi-4.6/bin/arm-eabi-'
-Tool chain test:  OK, arch='arm', priority 1
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/i386-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/i386-linux/bin/i386-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/usr/bin'
-Tool chain test:  OK, arch='i386', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/aarch64-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/usr/bin'
-Tool chain test:  OK, arch='aarch64', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/microblaze-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin/microblaze-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/usr/bin'
-Tool chain test:  OK, arch='microblaze', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/mips64-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/mips64-linux/bin/mips64-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/usr/bin'
-Tool chain test:  OK, arch='mips64', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/sparc64-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/usr/bin'
-Tool chain test:  OK, arch='sparc64', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/usr/bin'
-Tool chain test:  OK, arch='arm', priority 3
-Toolchain '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc' at priority 3 will be ignored because another toolchain for arch 'arm' has priority 1
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/sparc-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/sparc-linux/bin/sparc-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/usr/bin'
-Tool chain test:  OK, arch='sparc', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/mips-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/mips-linux/bin/mips-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/usr/bin'
-Tool chain test:  OK, arch='mips', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/x86_64-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc'
-         - found '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-x86_64-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/usr/bin'
-Tool chain test:  OK, arch='x86_64', priority 4
-Tool chain test:  OK, arch='x86_64', priority 4
-Toolchain '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-x86_64-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'x86_64' has priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/m68k-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/m68k-linux/bin/m68k-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/usr/bin'
-Tool chain test:  OK, arch='m68k', priority 4
-   - scanning path '/toolchains/gcc-4.9.0-nolibc/powerpc-linux'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/.'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin'
-         - found '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin/powerpc-linux-gcc'
-      - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/usr/bin'
-Tool chain test:  OK, arch='powerpc', priority 4
-   - scanning path '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/.'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin'
-         - found '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin/bfin-uclinux-gcc'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/usr/bin'
-Tool chain test:  OK, arch='bfin', priority 6
-   - scanning path '/toolchains/gcc-4.6.3-nolibc/sparc-linux'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/.'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin'
-         - found '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin/sparc-linux-gcc'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/usr/bin'
-Tool chain test:  OK, arch='sparc', priority 4
-Toolchain '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin/sparc-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'sparc' has priority 4
-   - scanning path '/toolchains/gcc-4.6.3-nolibc/mips-linux'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/.'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin'
-         - found '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/usr/bin'
-Tool chain test:  OK, arch='mips', priority 4
-Toolchain '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'mips' has priority 4
-   - scanning path '/toolchains/gcc-4.6.3-nolibc/m68k-linux'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/.'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin'
-         - found '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux-gcc'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/usr/bin'
-Tool chain test:  OK, arch='m68k', priority 4
-Toolchain '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'm68k' has priority 4
-   - scanning path '/toolchains/gcc-4.6.3-nolibc/powerpc-linux'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/.'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/bin'
-         - found '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc'
-      - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/usr/bin'
-Tool chain test:  OK, arch='powerpc', priority 4
-Tool chain test:  OK, arch='or32', priority 4
-   - scanning path '/'
-      - looking in '/.'
-      - looking in '/bin'
-      - looking in '/usr/bin'
-         - found '/usr/bin/i586-mingw32msvc-gcc'
-         - found '/usr/bin/c89-gcc'
-         - found '/usr/bin/x86_64-linux-gnu-gcc'
-         - found '/usr/bin/gcc'
-         - found '/usr/bin/c99-gcc'
-         - found '/usr/bin/arm-linux-gnueabi-gcc'
-         - found '/usr/bin/aarch64-linux-gnu-gcc'
-         - found '/usr/bin/winegcc'
-         - found '/usr/bin/arm-linux-gnueabihf-gcc'
-Tool chain test:  OK, arch='i586', priority 11
-Tool chain test:  OK, arch='c89', priority 11
-Tool chain test:  OK, arch='x86_64', priority 4
-Toolchain '/usr/bin/x86_64-linux-gnu-gcc' at priority 4 will be ignored because another toolchain for arch 'x86_64' has priority 4
-Tool chain test:  OK, arch='sandbox', priority 11
-Tool chain test:  OK, arch='c99', priority 11
-Tool chain test:  OK, arch='arm', priority 4
-Toolchain '/usr/bin/arm-linux-gnueabi-gcc' at priority 4 will be ignored because another toolchain for arch 'arm' has priority 1
-Tool chain test:  OK, arch='aarch64', priority 4
-Toolchain '/usr/bin/aarch64-linux-gnu-gcc' at priority 4 will be ignored because another toolchain for arch 'aarch64' has priority 4
-Tool chain test:  OK, arch='sandbox', priority 11
-Toolchain '/usr/bin/winegcc' at priority 11 will be ignored because another toolchain for arch 'sandbox' has priority 11
-Tool chain test:  OK, arch='arm', priority 4
-Toolchain '/usr/bin/arm-linux-gnueabihf-gcc' at priority 4 will be ignored because another toolchain for arch 'arm' has priority 1
-List of available toolchains (34):
-aarch64   : /toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc
-alpha     : /toolchains/gcc-4.9.0-nolibc/alpha-linux/bin/alpha-linux-gcc
-am33_2.0  : /toolchains/gcc-4.9.0-nolibc/am33_2.0-linux/bin/am33_2.0-linux-gcc
-arm       : /opt/arm-eabi-4.6/bin/arm-eabi-gcc
-bfin      : /toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin/bfin-uclinux-gcc
-c89       : /usr/bin/c89-gcc
-c99       : /usr/bin/c99-gcc
-frv       : /toolchains/gcc-4.9.0-nolibc/frv-linux/bin/frv-linux-gcc
-h8300     : /toolchains/gcc-4.9.0-nolibc/h8300-elf/bin/h8300-elf-gcc
-hppa      : /toolchains/gcc-4.9.0-nolibc/hppa-linux/bin/hppa-linux-gcc
-hppa64    : /toolchains/gcc-4.9.0-nolibc/hppa64-linux/bin/hppa64-linux-gcc
-i386      : /toolchains/gcc-4.9.0-nolibc/i386-linux/bin/i386-linux-gcc
-i586      : /usr/bin/i586-mingw32msvc-gcc
-ia64      : /toolchains/gcc-4.9.0-nolibc/ia64-linux/bin/ia64-linux-gcc
-m32r      : /toolchains/gcc-4.9.0-nolibc/m32r-linux/bin/m32r-linux-gcc
-m68k      : /toolchains/gcc-4.9.0-nolibc/m68k-linux/bin/m68k-linux-gcc
-microblaze: /toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin/microblaze-linux-gcc
-mips      : /toolchains/gcc-4.9.0-nolibc/mips-linux/bin/mips-linux-gcc
-mips64    : /toolchains/gcc-4.9.0-nolibc/mips64-linux/bin/mips64-linux-gcc
-or32      : /toolchains/gcc-4.5.1-nolibc/or32-linux/bin/or32-linux-gcc
-powerpc   : /toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin/powerpc-linux-gcc
-powerpc64 : /toolchains/gcc-4.9.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc
-ppc64le   : /toolchains/gcc-4.9.0-nolibc/ppc64le-linux/bin/ppc64le-linux-gcc
-s390x     : /toolchains/gcc-4.9.0-nolibc/s390x-linux/bin/s390x-linux-gcc
-sandbox   : /usr/bin/gcc
-sh4       : /toolchains/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-gcc
-sparc     : /toolchains/gcc-4.9.0-nolibc/sparc-linux/bin/sparc-linux-gcc
-sparc64   : /toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc
-tilegx    : /toolchains/gcc-4.6.2-nolibc/tilegx-linux/bin/tilegx-linux-gcc
-x86       : /opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc
-x86_64    : /toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc
-
-
-You can see that everything is covered, even some strange ones that won't
-be used (c88 and c99). This is a feature.
-
-
-5. Install new toolchains if needed
-
-You can download toolchains and update the [toolchain] section of the
-settings file to find them.
-
-To make this easier, buildman can automatically download and install
-toolchains from kernel.org. First list the available architectures:
-
-$ ./tools/buildman/buildman --fetch-arch list
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.2/
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1/
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.2.4/
-Available architectures: alpha am33_2.0 arm bfin cris crisv32 frv h8300
-hppa hppa64 i386 ia64 m32r m68k mips mips64 or32 powerpc powerpc64 s390x sh4
-sparc sparc64 tilegx x86_64 xtensa
-
-Then pick one and download it:
-
-$ ./tools/buildman/buildman --fetch-arch or32
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.2/
-Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1/
-Downloading: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1//x86_64-gcc-4.5.1-nolibc_or32-linux.tar.xz
-Unpacking to: /home/sjg/.buildman-toolchains
-Testing
-      - looking in '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/.'
-      - looking in '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/bin'
-         - found '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/bin/or32-linux-gcc'
-Tool chain test:  OK
-
-Or download them all from kernel.org and move them to /toolchains directory,
-
-$ ./tools/buildman/buildman --fetch-arch all
-$ sudo mkdir -p /toolchains
-$ sudo mv ~/.buildman-toolchains/*/* /toolchains/
-
-For those not available from kernel.org, download from the following links.
-
-arc: https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/
-    download/arc-2016.09-release/arc_gnu_2016.09_prebuilt_uclibc_le_archs_linux_install.tar.gz
-blackfin: http://sourceforge.net/projects/adi-toolchain/files/
-    blackfin-toolchain-elf-gcc-4.5-2014R1_45-RC2.x86_64.tar.bz2
-nios2: http://sourcery.mentor.com/public/gnu_toolchain/nios2-linux-gnu/
-    sourceryg++-2015.11-27-nios2-linux-gnu-i686-pc-linux-gnu.tar.bz2
-sh: http://sourcery.mentor.com/public/gnu_toolchain/sh-linux-gnu/
-    renesas-4.4-200-sh-linux-gnu-i686-pc-linux-gnu.tar.bz2
-
-Note openrisc kernel.org toolchain is out of date. Download the latest one from
-http://opencores.org/or1k/OpenRISC_GNU_tool_chain#Prebuilt_versions - eg:
-ftp://ocuser:ocuser@openrisc.opencores.org/toolchain/gcc-or1k-elf-4.8.1-x86.tar.bz2.
-
-Buildman should now be set up to use your new toolchain.
-
-At the time of writing, U-Boot has these architectures:
-
-   arc, arm, blackfin, m68k, microblaze, mips, nios2, openrisc
-   powerpc, sandbox, sh, sparc, x86
-
-Of these, only arc is not available at kernel.org..
-
-
-How to run it
-=============
-
-First do a dry run using the -n flag: (replace <branch> with a real, local
-branch with a valid upstream)
-
-$ ./tools/buildman/buildman -b <branch> -n
-
-If it can't detect the upstream branch, try checking out the branch, and
-doing something like 'git branch --set-upstream-to upstream/master'
-or something similar. Buildman will try to guess a suitable upstream branch
-if it can't find one (you will see a message like" Guessing upstream as ...).
-You can also use the -c option to manually specify the number of commits to
-build.
-
-As an example:
-
-Dry run, so not doing much. But I would do this:
-
-Building 18 commits for 1059 boards (4 threads, 1 job per thread)
-Build directory: ../lcd9b
-    5bb3505 Merge branch 'master' of git://git.denx.de/u-boot-arm
-    c18f1b4 tegra: Use const for pinmux_config_pingroup/table()
-    2f043ae tegra: Add display support to funcmux
-    e349900 tegra: fdt: Add pwm binding and node
-    424a5f0 tegra: fdt: Add LCD definitions for Tegra
-    0636ccf tegra: Add support for PWM
-    a994fe7 tegra: Add SOC support for display/lcd
-    fcd7350 tegra: Add LCD driver
-    4d46e9d tegra: Add LCD support to Nvidia boards
-    991bd48 arm: Add control over cachability of memory regions
-    54e8019 lcd: Add CONFIG_LCD_ALIGNMENT to select frame buffer alignment
-    d92aff7 lcd: Add support for flushing LCD fb from dcache after update
-    dbd0677 tegra: Align LCD frame buffer to section boundary
-    0cff9b8 tegra: Support control of cache settings for LCD
-    9c56900 tegra: fdt: Add LCD definitions for Seaboard
-    5cc29db lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
-    cac5a23 tegra: Enable display/lcd support on Seaboard
-    49ff541 wip
-
-Total boards to build for each commit: 1059
-
-This shows that it will build all 1059 boards, using 4 threads (because
-we have a 4-core CPU). Each thread will run with -j1, meaning that each
-make job will use a single CPU. The list of commits to be built helps you
-confirm that things look about right. Notice that buildman has chosen a
-'base' directory for you, immediately above your source tree.
-
-Buildman works entirely inside the base directory, here ../lcd9b,
-creating a working directory for each thread, and creating output
-directories for each commit and board.
-
-
-Suggested Workflow
-==================
-
-To run the build for real, take off the -n:
-
-$ ./tools/buildman/buildman -b <branch>
-
-Buildman will set up some working directories, and get started. After a
-minute or so it will settle down to a steady pace, with a display like this:
-
-Building 18 commits for 1059 boards (4 threads, 1 job per thread)
-  528   36  124 /19062    -18374  1:13:30  : SIMPC8313_SP
-
-This means that it is building 19062 board/commit combinations. So far it
-has managed to successfully build 528. Another 36 have built with warnings,
-and 124 more didn't build at all. It has 18374 builds left to complete.
-Buildman expects to complete the process in around an hour and a quarter.
-Use this time to buy a faster computer.
-
-
-To find out how the build went, ask for a summary with -s. You can do this
-either before the build completes (presumably in another terminal) or
-afterwards. Let's work through an example of how this is used:
-
-$ ./tools/buildman/buildman -b lcd9b -s
-...
-01: Merge branch 'master' of git://git.denx.de/u-boot-arm
-   powerpc:   + galaxy5200_LOWBOOT
-02: tegra: Use const for pinmux_config_pingroup/table()
-03: tegra: Add display support to funcmux
-04: tegra: fdt: Add pwm binding and node
-05: tegra: fdt: Add LCD definitions for Tegra
-06: tegra: Add support for PWM
-07: tegra: Add SOC support for display/lcd
-08: tegra: Add LCD driver
-09: tegra: Add LCD support to Nvidia boards
-10: arm: Add control over cachability of memory regions
-11: lcd: Add CONFIG_LCD_ALIGNMENT to select frame buffer alignment
-12: lcd: Add support for flushing LCD fb from dcache after update
-       arm:   + lubbock
-13: tegra: Align LCD frame buffer to section boundary
-14: tegra: Support control of cache settings for LCD
-15: tegra: fdt: Add LCD definitions for Seaboard
-16: lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
-17: tegra: Enable display/lcd support on Seaboard
-18: wip
-
-This shows which commits have succeeded and which have failed. In this case
-the build is still in progress so many boards are not built yet (use -u to
-see which ones). But already we can see a few failures. The galaxy5200_LOWBOOT
-never builds correctly. This could be a problem with our toolchain, or it
-could be a bug in the upstream. The good news is that we probably don't need
-to blame our commits. The bad news is that our commits are not tested on that
-board.
-
-Commit 12 broke lubbock. That's what the '+ lubbock', in red, means. The
-failure is never fixed by a later commit, or you would see lubbock again, in
-green, without the +.
-
-To see the actual error:
-
-$ ./tools/buildman/buildman -b <branch> -se
-...
-12: lcd: Add support for flushing LCD fb from dcache after update
-       arm:   + lubbock
-+common/libcommon.o: In function `lcd_sync':
-+common/lcd.c:120: undefined reference to `flush_dcache_range'
-+arm-none-linux-gnueabi-ld: BFD (Sourcery G++ Lite 2010q1-202) 2.19.51.20090709 assertion fail /scratch/julian/2010q1-release-linux-lite/obj/binutils-src-2010q1-202-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf32-arm.c:12572
-+make: *** [build/u-boot] Error 139
-13: tegra: Align LCD frame buffer to section boundary
-14: tegra: Support control of cache settings for LCD
-15: tegra: fdt: Add LCD definitions for Seaboard
-16: lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
--common/lcd.c:120: undefined reference to `flush_dcache_range'
-+common/lcd.c:125: undefined reference to `flush_dcache_range'
-17: tegra: Enable display/lcd support on Seaboard
-18: wip
-
-So the problem is in lcd.c, due to missing cache operations. This information
-should be enough to work out what that commit is doing to break these
-boards. (In this case pxa did not have cache operations defined).
-
-Note that if there were other boards with errors, the above command would
-show their errors also. Each line is shown only once. So if lubbock and snow
-produce the same error, we just see:
-
-12: lcd: Add support for flushing LCD fb from dcache after update
-       arm:   + lubbock snow
-+common/libcommon.o: In function `lcd_sync':
-+common/lcd.c:120: undefined reference to `flush_dcache_range'
-+arm-none-linux-gnueabi-ld: BFD (Sourcery G++ Lite 2010q1-202) 2.19.51.20090709 assertion fail /scratch/julian/2010q1-release-linux-lite/obj/binutils-src-2010q1-202-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf32-arm.c:12572
-+make: *** [build/u-boot] Error 139
-
-But if you did want to see just the errors for lubbock, use:
-
-$ ./tools/buildman/buildman -b <branch> -se lubbock
-
-If you see error lines marked with '-', that means that the errors were fixed
-by that commit. Sometimes commits can be in the wrong order, so that a
-breakage is introduced for a few commits and fixed by later commits. This
-shows up clearly with buildman. You can then reorder the commits and try
-again.
-
-At commit 16, the error moves: you can see that the old error at line 120
-is fixed, but there is a new one at line 126. This is probably only because
-we added some code and moved the broken line further down the file.
-
-As mentioned, if many boards have the same error, then -e will display the
-error only once. This makes the output as concise as possible. To see which
-boards have each error, use -l. So it is safe to omit the board name - you
-will not get lots of repeated output for every board.
-
-Buildman tries to distinguish warnings from errors, and shows warning lines
-separately with a 'w' prefix. Warnings introduced show as yellow. Warnings
-fixed show as cyan.
-
-The full build output in this case is available in:
-
-../lcd9b/12_of_18_gd92aff7_lcd--Add-support-for/lubbock/
-
-   done: Indicates the build was done, and holds the return code from make.
-         This is 0 for a good build, typically 2 for a failure.
-
-   err:  Output from stderr, if any. Errors and warnings appear here.
-
-   log:  Output from stdout. Normally there isn't any since buildman runs
-         in silent mode. Use -V to force a verbose build (this passes V=1
-         to 'make')
-
-   toolchain: Shows information about the toolchain used for the build.
-
-   sizes: Shows image size information.
-
-It is possible to get the build binary output there also. Use the -k option
-for this. In that case you will also see some output files, like:
-
-   System.map  toolchain  u-boot  u-boot.bin  u-boot.map  autoconf.mk
-   (also SPL versions u-boot-spl and u-boot-spl.bin if available)
-
-
-Checking Image Sizes
-====================
-
-A key requirement for U-Boot is that you keep code/data size to a minimum.
-Where a new feature increases this noticeably it should normally be put
-behind a CONFIG flag so that boards can leave it disabled and keep the image
-size more or less the same with each new release.
-
-To check the impact of your commits on image size, use -S. For example:
-
-$ ./tools/buildman/buildman -b us-x86 -sS
-Summary of 10 commits for 1066 boards (4 threads, 1 job per thread)
-01: MAKEALL: add support for per architecture toolchains
-02: x86: Add function to get top of usable ram
-       x86: (for 1/3 boards)  text -272.0  rodata +41.0
-03: x86: Add basic cache operations
-04: x86: Permit bootstage and timer data to be used prior to relocation
-       x86: (for 1/3 boards)  data +16.0
-05: x86: Add an __end symbol to signal the end of the U-Boot binary
-       x86: (for 1/3 boards)  text +76.0
-06: x86: Rearrange the output input to remove BSS
-       x86: (for 1/3 boards)  bss -2140.0
-07: x86: Support relocation of FDT on start-up
-       x86: +   coreboot-x86
-08: x86: Add error checking to x86 relocation code
-09: x86: Adjust link device tree include file
-10: x86: Enable CONFIG_OF_CONTROL on coreboot
-
-
-You can see that image size only changed on x86, which is good because this
-series is not supposed to change any other board. From commit 7 onwards the
-build fails so we don't get code size numbers. The numbers are fractional
-because they are an average of all boards for that architecture. The
-intention is to allow you to quickly find image size problems introduced by
-your commits.
-
-Note that the 'text' region and 'rodata' are split out. You should add the
-two together to get the total read-only size (reported as the first column
-in the output from binutil's 'size' utility).
-
-A useful option is --step which lets you skip some commits. For example
---step 2 will show the image sizes for only every 2nd commit (so it will
-compare the image sizes of the 1st, 3rd, 5th... commits). You can also use
---step 0 which will compare only the first and last commits. This is useful
-for an overview of how your entire series affects code size. It will build
-only the upstream commit and your final branch commit.
-
-You can also use -d to see a detailed size breakdown for each board. This
-list is sorted in order from largest growth to largest reduction.
-
-It is even possible to go a little further with the -B option (--bloat). This
-shows where U-Boot has bloated, breaking the size change down to the function
-level. Example output is below:
-
-$ ./tools/buildman/buildman -b us-mem4 -sSdB
-...
-19: Roll crc32 into hash infrastructure
-       arm: (for 10/10 boards)  all -143.4  bss +1.2  data -4.8  rodata -48.2 text -91.6
-            paz00          :  all +23  bss -4  rodata -29  text +56
-               u-boot: add: 1/0, grow: 3/-2 bytes: 168/-104 (64)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 ext4fs_read_file                           540     568     +28
-                 insert_var_value_sub                       688     692      +4
-                 run_list_real                             1996    1992      -4
-                 do_mem_crc                                 168      68    -100
-            trimslice      :  all -9  bss +16  rodata -29  text +4
-               u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 ext4fs_iterate_dir                         672     668      -4
-                 ext4fs_read_file                           568     548     -20
-                 do_mem_crc                                 168      68    -100
-            whistler       :  all -9  bss +16  rodata -29  text +4
-               u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 ext4fs_iterate_dir                         672     668      -4
-                 ext4fs_read_file                           568     548     -20
-                 do_mem_crc                                 168      68    -100
-            seaboard       :  all -9  bss -28  rodata -29  text +48
-               u-boot: add: 1/0, grow: 3/-2 bytes: 160/-104 (56)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 ext4fs_read_file                           548     568     +20
-                 run_list_real                             1996    2000      +4
-                 do_nandboot                                760     756      -4
-                 do_mem_crc                                 168      68    -100
-            colibri_t20    :  all -9  rodata -29  text +20
-               u-boot: add: 1/0, grow: 2/-3 bytes: 140/-112 (28)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 read_abs_bbt                               204     208      +4
-                 do_nandboot                                760     756      -4
-                 ext4fs_read_file                           576     568      -8
-                 do_mem_crc                                 168      68    -100
-            ventana        :  all -37  bss -12  rodata -29  text +4
-               u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 ext4fs_iterate_dir                         672     668      -4
-                 ext4fs_read_file                           568     548     -20
-                 do_mem_crc                                 168      68    -100
-            harmony        :  all -37  bss -16  rodata -29  text +8
-               u-boot: add: 1/0, grow: 2/-3 bytes: 140/-124 (16)
-                 function                                   old     new   delta
-                 hash_command                                80     160     +80
-                 crc32_wd_buf                                 -      56     +56
-                 nand_write_oob_syndrome                    428     432      +4
-                 ext4fs_iterate_dir                         672     668      -4
-                 ext4fs_read_file                           568     548     -20
-                 do_mem_crc                                 168      68    -100
-            medcom-wide    :  all -417  bss +28  data -16  rodata -93  text -336
-               u-boot: add: 1/-1, grow: 1/-2 bytes: 88/-376 (-288)
-                 function                                   old     new   delta
-                 crc32_wd_buf                                 -      56     +56
-                 do_fat_read_at                            2872    2904     +32
-                 hash_algo                                   16       -     -16
-                 do_mem_crc                                 168      68    -100
-                 hash_command                               420     160    -260
-            tec            :  all -449  bss -4  data -16  rodata -93  text -336
-               u-boot: add: 1/-1, grow: 1/-2 bytes: 88/-376 (-288)
-                 function                                   old     new   delta
-                 crc32_wd_buf                                 -      56     +56
-                 do_fat_read_at                            2872    2904     +32
-                 hash_algo                                   16       -     -16
-                 do_mem_crc                                 168      68    -100
-                 hash_command                               420     160    -260
-            plutux         :  all -481  bss +16  data -16  rodata -93  text -388
-               u-boot: add: 1/-1, grow: 1/-3 bytes: 68/-408 (-340)
-                 function                                   old     new   delta
-                 crc32_wd_buf                                 -      56     +56
-                 do_load_serial_bin                        1688    1700     +12
-                 hash_algo                                   16       -     -16
-                 do_fat_read_at                            2904    2872     -32
-                 do_mem_crc                                 168      68    -100
-                 hash_command                               420     160    -260
-   powerpc: (for 5/5 boards)  all +37.4  data -3.2  rodata -41.8  text +82.4
-            MPC8610HPCD    :  all +55  rodata -29  text +84
-               u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
-                 function                                   old     new   delta
-                 hash_command                                 -     176    +176
-                 do_mem_crc                                 184      88     -96
-            MPC8641HPCN    :  all +55  rodata -29  text +84
-               u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
-                 function                                   old     new   delta
-                 hash_command                                 -     176    +176
-                 do_mem_crc                                 184      88     -96
-            MPC8641HPCN_36BIT:  all +55  rodata -29  text +84
-               u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
-                 function                                   old     new   delta
-                 hash_command                                 -     176    +176
-                 do_mem_crc                                 184      88     -96
-            sbc8641d       :  all +55  rodata -29  text +84
-               u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
-                 function                                   old     new   delta
-                 hash_command                                 -     176    +176
-                 do_mem_crc                                 184      88     -96
-            xpedite517x    :  all -33  data -16  rodata -93  text +76
-               u-boot: add: 1/-1, grow: 0/-1 bytes: 176/-112 (64)
-                 function                                   old     new   delta
-                 hash_command                                 -     176    +176
-                 hash_algo                                   16       -     -16
-                 do_mem_crc                                 184      88     -96
-...
-
-
-This shows that commit 19 has reduced codesize for arm slightly and increased
-it for powerpc. This increase was offset in by reductions in rodata and
-data/bss.
-
-Shown below the summary lines are the sizes for each board. Below each board
-are the sizes for each function. This information starts with:
-
-   add - number of functions added / removed
-   grow - number of functions which grew / shrunk
-   bytes - number of bytes of code added to / removed from all functions,
-            plus the total byte change in brackets
-
-The change seems to be that hash_command() has increased by more than the
-do_mem_crc() function has decreased. The function sizes typically add up to
-roughly the text area size, but note that every read-only section except
-rodata is included in 'text', so the function total does not exactly
-correspond.
-
-It is common when refactoring code for the rodata to decrease as the text size
-increases, and vice versa.
-
-
-The .buildman file
-==================
-
-The .buildman file provides information about the available toolchains and
-also allows build flags to be passed to 'make'. It consists of several
-sections, with the section name in square brackets. Within each section are
-a set of (tag, value) pairs.
-
-'[toolchain]' section
-
-    This lists the available toolchains. The tag here doesn't matter, but
-    make sure it is unique. The value is the path to the toolchain. Buildman
-    will look in that path for a file ending in 'gcc'. It will then execute
-    it to check that it is a C compiler, passing only the --version flag to
-    it. If the return code is 0, buildman assumes that it is a valid C
-    compiler. It uses the first part of the name as the architecture and
-    strips off the last part when setting the CROSS_COMPILE environment
-    variable (parts are delimited with a hyphen).
-
-    For example powerpc-linux-gcc will be noted as a toolchain for 'powerpc'
-    and CROSS_COMPILE will be set to powerpc-linux- when using it.
-
-'[toolchain-alias]' section
-
-    This converts toolchain architecture names to U-Boot names. For example,
-    if an x86 toolchains is called i386-linux-gcc it will not normally be
-    used for architecture 'x86'. Adding 'x86: i386 x86_64' to this section
-    will tell buildman that the i386 and x86_64 toolchains can be used for
-    the x86 architecture.
-
-'[make-flags]' section
-
-    U-Boot's build system supports a few flags (such as BUILD_TAG) which
-    affect the build product. These flags can be specified in the buildman
-    settings file. They can also be useful when building U-Boot against other
-    open source software.
-
-    [make-flags]
-    at91-boards=ENABLE_AT91_TEST=1
-    snapper9260=${at91-boards} BUILD_TAG=442
-    snapper9g45=${at91-boards} BUILD_TAG=443
-
-    This will use 'make ENABLE_AT91_TEST=1 BUILD_TAG=442' for snapper9260
-    and 'make ENABLE_AT91_TEST=1 BUILD_TAG=443' for snapper9g45. A special
-    variable ${target} is available to access the target name (snapper9260
-    and snapper9g20 in this case). Variables are resolved recursively. Note
-    that variables can only contain the characters A-Z, a-z, 0-9, hyphen (-)
-    and underscore (_).
-
-    It is expected that any variables added are dealt with in U-Boot's
-    config.mk file and documented in the README.
-
-    Note that you can pass ad-hoc options to the build using environment
-    variables, for example:
-
-       SOME_OPTION=1234 ./tools/buildman/buildman my_board
-
-
-Quick Sanity Check
-==================
-
-If you have made changes and want to do a quick sanity check of the
-currently checked-out source, run buildman without the -b flag. This will
-build the selected boards and display build status as it runs (i.e. -v is
-enabled automatically). Use -e to see errors/warnings as well.
-
-
-Building Ranges
-===============
-
-You can build a range of commits by specifying a range instead of a branch
-when using the -b flag. For example:
-
-    upstream/master..us-buildman
-
-will build commits in us-buildman that are not in upstream/master.
-
-
-Building Faster
-===============
-
-By default, buildman doesn't execute 'make mrproper' prior to building the
-first commit for each board. This reduces the amount of work 'make' does, and
-hence speeds up the build. To force use of 'make mrproper', use -the -m flag.
-This flag will slow down any buildman invocation, since it increases the amount
-of work done on any build.
-
-One possible application of buildman is as part of a continual edit, build,
-edit, build, ... cycle; repeatedly applying buildman to the same change or
-series of changes while making small incremental modifications to the source
-each time. This provides quick feedback regarding the correctness of recent
-modifications. In this scenario, buildman's default choice of build directory
-causes more build work to be performed than strictly necessary.
-
-By default, each buildman thread uses a single directory for all builds. When a
-thread builds multiple boards, the configuration built in this directory will
-cycle through various different configurations, one per board built by the
-thread. Variations in the configuration will force a rebuild of affected source
-files when a thread switches between boards. Ideally, such buildman-induced
-rebuilds would not happen, thus allowing the build to operate as efficiently as
-the build system and source changes allow. buildman's -P flag may be used to
-enable this; -P causes each board to be built in a separate (board-specific)
-directory, thus avoiding any buildman-induced configuration changes in any
-build directory.
-
-U-Boot's build system embeds information such as a build timestamp into the
-final binary. This information varies each time U-Boot is built. This causes
-various files to be rebuilt even if no source changes are made, which in turn
-requires that the final U-Boot binary be re-linked. This unnecessary work can
-be avoided by turning off the timestamp feature. This can be achieved by
-setting the SOURCE_DATE_EPOCH environment variable to 0.
-
-Combining all of these options together yields the command-line shown below.
-This will provide the quickest possible feedback regarding the current content
-of the source tree, thus allowing rapid tested evolution of the code.
-
-    SOURCE_DATE_EPOCH=0 ./tools/buildman/buildman -P tegra
-
-
-Checking configuration
-======================
-
-A common requirement when converting CONFIG options to Kconfig is to check
-that the effective configuration has not changed due to the conversion.
-Buildman supports this with the -K option, used after a build. This shows
-differences in effective configuration between one commit and the next.
-
-For example:
-
-    $ buildman -b kc4 -sK
-    ...
-    43: Convert CONFIG_SPL_USBETH_SUPPORT to Kconfig
-    arm:
-    + u-boot.cfg: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_NET=1
-    + u-boot-spl.cfg: CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1
-    + all: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1 CONFIG_SPL_NET=1
-    am335x_evm_usbspl :
-    + u-boot.cfg: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_NET=1
-    + u-boot-spl.cfg: CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1
-    + all: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1 CONFIG_SPL_NET=1
-    44: Convert CONFIG_SPL_USB_HOST to Kconfig
-    ...
-
-This shows that commit 44 enabled three new options for the board
-am335x_evm_usbspl which were not enabled in commit 43. There is also a
-summary for 'arm' showing all the changes detected for that architecture.
-In this case there is only one board with changes, so 'arm' output is the
-same as 'am335x_evm_usbspl'/
-
-The -K option uses the u-boot.cfg, spl/u-boot-spl.cfg and tpl/u-boot-tpl.cfg
-files which are produced by a build. If all you want is to check the
-configuration you can in fact avoid doing a full build, using -D. This tells
-buildman to configuration U-Boot and create the .cfg files, but not actually
-build the source. This is 5-10 times faster than doing a full build.
-
-By default buildman considers the follow two configuration methods
-equivalent:
-
-   #define CONFIG_SOME_OPTION
-
-   CONFIG_SOME_OPTION=y
-
-The former would appear in a header filer and the latter in a defconfig
-file. The achieve this, buildman considers 'y' to be '1' in configuration
-variables. This avoids lots of useless output when converting a CONFIG
-option to Kconfig. To disable this behaviour, use --squash-config-y.
-
-
-Checking the environment
-========================
-
-When converting CONFIG options which manipulate the default environment,
-a common requirement is to check that the default environment has not
-changed due to the conversion. Buildman supports this with the -U option,
-used after a build. This shows differences in the default environment
-between one commit and the next.
-
-For example:
-
-$ buildman -b squash brppt1 -sU
-Summary of 2 commits for 3 boards (3 threads, 3 jobs per thread)
-01: Migrate bootlimit to Kconfig
-02: Squashed commit of the following:
-   c brppt1_mmc: altbootcmd=mmc dev 1; run mmcboot0; -> mmc dev 1; run mmcboot0
-   c brppt1_spi: altbootcmd=mmc dev 1; run mmcboot0; -> mmc dev 1; run mmcboot0
-   + brppt1_nand: altbootcmd=run usbscript
-   - brppt1_nand:  altbootcmd=run usbscript
-(no errors to report)
-
-This shows that commit 2 modified the value of 'altbootcmd' for 'brppt1_mmc'
-and 'brppt1_spi', removing a trailing semicolon. 'brppt1_nand' gained an a
-value for 'altbootcmd', but lost one for ' altbootcmd'.
-
-The -U option uses the u-boot.env files which are produced by a build.
-
-
-Building with clang
-===================
-
-To build with clang (sandbox only), use the -O option to override the
-toolchain. For example:
-
-   buildman -O clang-7 --board sandbox
-
-
-Doing a simple build
-====================
-
-In some cases you just want to build a single board and get the full output, use
-the -w option, for example:
-
-   buildman -o /tmp/build --board sandbox -w
-
-This will write the full build into /tmp/build including object files. You must
-specify the output directory with -o when using -w.
-
-
-Support for IDEs (Integrated Development Environments)
-======================================================
-
-Normally buildman summarises the output and shows information indicating the
-meaning of each line of output. For example a '+' symbol appears at the start of
-each error line. Also, buildman prints information about what it is about to do,
-along with a summary at the end.
-
-When using buildman from an IDE, it is helpful to drop this behaviour. Use the
--I/--ide option for that. You might find -W helpful also so that warnings do
-not cause the build to fail:
-
-   buildman -o /tmp/build --board sandbox -wWI
-
-
-Changing the configuration
-==========================
-
-Sometimes it is useful to change the CONFIG options for a build on the fly. This
-can be used to build a board (or multiple) with a few changes to see the impact.
-The -a option supports this:
-
-   -a <cfg>
-
-where <cfg> is a CONFIG option (with or without the CONFIG_ prefix) to enable.
-For example:
-
-    buildman -a CMD_SETEXPR_FMT
-
-will build with CONFIG_CMD_SETEXPR_FMT enabled.
-
-You can disable options by preceding them with tilde (~). You can specify the
--a option multiple times:
-
-    buildman -a CMD_SETEXPR_FMT -a ~CMDLINE
-
-Some options have values, in which case you can change them:
-
-    buildman -a 'BOOTCOMMAND="echo hello"' CONFIG_SYS_LOAD_ADDR=0x1000
-
-Note that you must put quotes around string options and the whole thing must be
-in single quotes, to make sure the shell leave it alone.
-
-If you try to set an option that does not exist, or that cannot be changed for
-some other reason (e.g. it is 'selected' by another option), then buildman
-shows an error:
-
-   buildman --board sandbox -a FRED
-   Building current source for 1 boards (1 thread, 32 jobs per thread)
-       0    0    0 /1       -1      (starting)errs
-   Some CONFIG adjustments did not take effect. This may be because
-   the request CONFIGs do not exist or conflict with others.
-
-   Failed adjustments:
-
-   FRED                  Missing expected line: CONFIG_FRED=y
-
-
-One major caveat with this feature with branches (-b) is that buildman does not
-name the output directories differently when you change the configuration, so
-doing the same build again with different configuration will not trigger a
-rebuild. You can use -f to work around that.
-
-
-Other options
-=============
-
-Buildman has various other command-line options. Try --help to see them.
-
-To find out what toolchain prefix buildman will use for a build, use the -A
-option.
-
-To request that compiler warnings be promoted to errors, use -E. This passes the
--Werror flag to the compiler. Note that the build can still produce warnings
-with -E, e.g. the migration warnings:
-
-        ===================== WARNING ======================
-        This board does not use CONFIG_DM_MMC. Please update
-        ...
-        ====================================================
-
-When doing builds, Buildman's return code will reflect the overall result:
-
-    0 (success)     No errors or warnings found
-    100             Errors found
-    101             Warnings found (only if no -W)
-
-You can use -W to tell Buildman to return 0 (success) instead of 101 when
-warnings are found. Note that it can be useful to combine -E and -W. This means
-that all compiler warnings will produce failures (code 100) and all other
-warnings will produce success (since 101 is changed to 0).
-
-If there are both warnings and errors, errors win, so buildman returns 100.
-
-The -y option is provided (for use with -s) to ignore the bountiful device-tree
-warnings. Similarly, -Y tells buildman to ignore the migration warnings.
-
-Sometimes you might get an error in a thread that is not handled by buildman,
-perhaps due to a failure of a tool that it calls. You might see the output, but
-then buildman hangs. Failing to handle any eventuality is a bug in buildman and
-should be reported. But you can use -T0 to disable threading and hopefully
-figure out the root cause of the build failure.
-
-Build summary
-=============
-
-When buildman finishes it shows a summary, something like this:
-
-    Completed: 5 total built, duration 0:00:21, rate 0.24
-
-This shows that a total of 5 builds were done across all selected boards, it
-took 21 seconds and the builds happened at the rate of 0.24 per second. The
-latter number depends on the speed of your machine and the efficiency of the
-U-Boot build.
-
-
-How to change from MAKEALL
-==========================
-
-Buildman includes most of the features of MAKEALL and is generally faster
-and easier to use. In particular it builds entire branches: if a particular
-commit introduces an error in a particular board, buildman can easily show
-you this, even if a later commit fixes that error.
-
-The reasons to deprecate MAKEALL are:
-- We don't want to maintain two build systems
-- Buildman is typically faster
-- Buildman has a lot more features
-
-But still, many people will be sad to lose MAKEALL. If you are used to
-MAKEALL, here are a few pointers.
-
-First you need to set up your tool chains - see the 'Setting up' section
-for details. Once you have your required toolchain(s) detected then you are
-ready to go.
-
-To build the current source tree, run buildman without a -b flag:
-
-   ./tools/buildman/buildman <list of things to build>
-
-This will build the current source tree for the given boards and display
-the results and errors.
-
-However buildman usually works on entire branches, and for that you must
-specify a board flag:
-
-   ./tools/buildman/buildman -b <branch_name> <list of things to build>
-
-followed by (afterwards, or perhaps concurrently in another terminal):
-
-   ./tools/buildman/buildman -b <branch_name> -s <list of things to build>
-
-to see the results of the build. Rather than showing you all the output,
-buildman just shows a summary, with red indicating that a commit introduced
-an error and green indicating that a commit fixed an error. Use the -e
-flag to see the full errors and -l to see which boards caused which errors.
-
-If you really want to see build results as they happen, use -v when doing a
-build (and -e to see the errors/warnings too).
-
-You don't need to stick around on that branch while buildman is running. It
-checks out its own copy of the source code, so you can change branches,
-add commits, etc. without affecting the build in progress.
-
-The <list of things to build> can include board names, architectures or the
-like. There are no flags to disambiguate since ambiguities are rare. Using
-the examples from MAKEALL:
-
-Examples:
-  - build all Power Architecture boards:
-      MAKEALL -a powerpc
-      MAKEALL --arch powerpc
-      MAKEALL powerpc
-          ** buildman -b <branch> powerpc
-  - build all PowerPC boards manufactured by vendor "esd":
-      MAKEALL -a powerpc -v esd
-          ** buildman -b <branch> esd
-  - build all PowerPC boards manufactured either by "keymile" or "siemens":
-      MAKEALL -a powerpc -v keymile -v siemens
-          ** buildman -b <branch> keymile siemens
-  - build all Freescale boards with MPC83xx CPUs, plus all 4xx boards:
-      MAKEALL -c mpc83xx -v freescale 4xx
-          ** buildman -b <branch> mpc83xx freescale 4xx
-
-Buildman automatically tries to use all the CPUs in your machine. If you
-are building a lot of boards it will use one thread for every CPU core
-it detects in your machine. This is like MAKEALL's BUILD_NBUILDS option.
-You can use the -T flag to change the number of threads. If you are only
-building a few boards, buildman will automatically run make with the -j
-flag to increase the number of concurrent make tasks. It isn't normally
-that helpful to fiddle with this option, but if you use the BUILD_NCPUS
-option in MAKEALL then -j is the equivalent in buildman.
-
-Buildman puts its output in ../<branch_name> by default but you can change
-this with the -o option. Buildman normally does out-of-tree builds: use -i
-to disable that if you really want to. But be careful that once you have
-used -i you pollute buildman's copies of the source tree, and you will need
-to remove the build directory (normally ../<branch_name>) to run buildman
-in normal mode (without -i).
-
-Buildman doesn't keep the output result normally, but use the -k option to
-do this.
-
-Please read 'Theory of Operation' a few times as it will make a lot of
-things clearer.
-
-Some options you might like are:
-
-   -B shows which functions are growing/shrinking in which commit - great
-        for finding code bloat.
-   -S shows image sizes for each commit (just an overall summary)
-   -u shows boards that you haven't built yet
-   --step 0 will build just the upstream commit and the last commit of your
-        branch. This is often a quick sanity check that your branch doesn't
-        break anything. But note this does not check bisectability!
-
-
-Using boards.cfg
-================
-
-This file is no-longer needed by buildman but it is still generated in the
-working directory. This helps avoid a delay on every build, since scanning all
-the Kconfig files takes a few seconds. Use the -R flag to force regeneration
-of the file - in that case buildman exits after writing the file. with exit code
-2 if there was an error in the maintainer files.
-
-You should use 'buildman -nv <criteria>' instead of greoing the boards.cfg file,
-since it may be dropped altogether in future.
-
-
-TODO
-====
-
-Many improvements have been made over the years. There is still quite a bit of
-scope for more though, e.g.:
-
-- easier access to log files
-- 'hunting' for problems, perhaps by building a few boards for each arch, or
-  checking commits for changed files and building only boards which use those
-  files
-
-
-Credits
-=======
-
-Thanks to Grant Grundler <grundler@chromium.org> for his ideas for improving
-the build speed by building all commits for a board instead of the other
-way around.
-
-
-Simon Glass
-sjg@chromium.org
-Halloween 2012
-Updated 12-12-12
-Updated 23-02-13
-Updated 09-04-20
diff --git a/tools/buildman/README.rst b/tools/buildman/README.rst
new file mode 120000
index 00000000000..c359387b2b5
--- /dev/null
+++ b/tools/buildman/README.rst
@@ -0,0 +1 @@
+buildman.rst
\ No newline at end of file
diff --git a/tools/buildman/buildman.rst b/tools/buildman/buildman.rst
new file mode 100644
index 00000000000..69a83ec3087
--- /dev/null
+++ b/tools/buildman/buildman.rst
@@ -0,0 +1,1413 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+Buildman build tool
+===================
+
+(Please read 'How to change from MAKEALL' if you are used to that tool)
+
+Quick-start
+-----------
+
+If you just want to quickly set up buildman so you can build something (for
+example Raspberry Pi 2):
+
+.. code-block:: bash
+
+   cd /path/to/u-boot
+   PATH=$PATH:`pwd`/tools/buildman
+   buildman --fetch-arch arm
+   buildman -k rpi_2
+   ls ../current/rpi_2
+   # u-boot.bin is the output image
+
+
+What is this?
+-------------
+
+This tool handles building U-Boot to check that you have not broken it
+with your patch series. It can build each individual commit and report
+which boards fail on which commits, and which errors come up. It aims
+to make full use of multi-processor machines.
+
+A key feature of buildman is its output summary, which allows warnings,
+errors or image size increases in a particular commit or board to be
+quickly identified and the offending commit pinpointed. This can be a big
+help for anyone working with >10 patches at a time.
+
+
+Caveats
+-------
+
+Buildman can be stopped and restarted, in which case it will continue
+where it left off. This should happen cleanly and without side-effects.
+If not, it is a bug, for which a patch would be welcome.
+
+Buildman gets so tied up in its work that it can ignore the outside world.
+You may need to press Ctrl-C several times to quit it. Also it will print
+out various exceptions when stopped. You may have to kill it since the
+Ctrl-C handling is somewhat broken.
+
+
+Theory of Operation
+-------------------
+
+(please read this section in full twice or you will be perpetually confused)
+
+Buildman is a builder. It is not make, although it runs make. It does not
+produce any useful output on the terminal while building, except for
+progress information (but see -v below). All the output (errors, warnings and
+binaries if you ask for them) is stored in output directories, which you can
+look at from a separate 'buildman -s' instance while the build is progressing,
+or when it is finished.
+
+Buildman is designed to build entire git branches, i.e. muliple commits. It
+can be run repeatedly on the same branch after making changes to commits on
+that branch. In this case it will automatically rebuild commits which have
+changed (and remove its old results for that commit). It is possible to build
+a branch for one board, then later build it for another board. This adds to
+the output, so now you have results for two boards. If you want buildman to
+re-build a commit it has already built (e.g. because of a toolchain update),
+use the -f flag.
+
+Buildman produces a concise summary of which boards succeeded and failed.
+It shows which commit introduced which board failure using a simple
+red/green colour coding (with yellow/cyan for warnings). Full error
+information can be requested, in which case it is de-duped and displayed
+against the commit that introduced the error. An example workflow is below.
+
+Buildman stores image size information and can report changes in image size
+from commit to commit. An example of this is below.
+
+Buildman starts multiple threads, and each thread builds for one board at
+a time. A thread starts at the first commit, configures the source for your
+board and builds it. Then it checks out the next commit and does an
+incremental build (i.e. not using 'make xxx_defconfig' unless you use -C).
+Eventually the thread reaches the last commit and stops. If a commit causes
+an error or warning, buildman will try it again after reconfiguring (but see
+-Q). Thus some commits may be built twice, with the first result silently
+discarded. Lots of errors and warnings will causes lots of reconfigures and your
+build will be very slow. This is because a file that produces just a warning
+would not normally be rebuilt in an incremental build. Once a thread finishes
+building all the commits for a board, it starts on the commits for another
+board.
+
+Buildman works in an entirely separate place from your U-Boot repository.
+It creates a separate working directory for each thread, and puts the
+output files in the working directory, organised by commit name and board
+name, in a two-level hierarchy (but see -P).
+
+Buildman is invoked in your U-Boot directory, the one with the .git
+directory. It clones this repository into a copy for each thread, and the
+threads do not affect the state of your git repository. Any checkouts done
+by the thread affect only the working directory for that thread.
+
+Buildman automatically selects the correct tool chain for each board. You
+must supply suitable tool chains (see --fetch-arch), but buildman takes care
+of selecting the right one.
+
+Buildman generally builds a branch (with the -b flag), and in this case
+builds the upstream commit as well, for comparison. So even if you have one
+commit in your branch, two commits will be built. Put all your commits in a
+branch, set the branch's upstream to a valid value, and all will be well.
+Otherwise buildman will perform random actions. Use -n to check what the
+random actions might be.
+
+Buildman effectively has two modes: without -s it builds, with -s it
+summarises the results of previous (or active) builds.
+
+If you just want to build the current source tree, leave off the -b flag.
+This will display results and errors as they happen. You can still look at
+them later using -se. Note that buildman will assume that the source has
+changed, and will build all specified boards in this case.
+
+Buildman is optimised for building many commits at once, for many boards.
+On multi-core machines, Buildman is fast because it uses most of the
+available CPU power. When it gets to the end, or if you are building just
+a few commits or boards, it will be pretty slow. As a tip, if you don't
+plan to use your machine for anything else, you can use -T to increase the
+number of threads beyond the default.
+
+
+Selecting which boards to build
+-------------------------------
+
+Buildman lets you build all boards, or a subset. Specify the subset by passing
+command-line arguments that list the desired build target, architecture,
+CPU, board name, vendor, SoC or options. Multiple arguments are allowed. Each
+argument will be interpreted as a regular expression, so behaviour is a superset
+of exact or substring matching. Examples are:
+
+'tegra20'
+   All boards with a Tegra20 SoC
+
+'tegra'
+   All boards with any Tegra Soc (Tegra20, Tegra30, Tegra114...)
+
+'^tegra[23]0$'
+   All boards with either Tegra20 or Tegra30 SoC
+
+'powerpc'
+   All PowerPC boards
+
+While the default is to OR the terms together, you can also make use of
+the '&' operator to limit the selection:
+
+'freescale & arm sandbox'
+   All Freescale boards with ARM architecture, plus sandbox
+
+You can also use -x to specifically exclude some boards. For example:
+
+  buildman arm -x nvidia,freescale,.*ball$
+
+means to build all arm boards except nvidia, freescale and anything ending
+with 'ball'.
+
+For building specific boards you can use the --boards (or --bo) option, which
+takes a comma-separated list of board target names and be used multiple times
+on the command line:
+
+.. code-block:: bash
+
+  buildman --boards sandbox,snow --boards
+
+It is convenient to use the -n option to see what will be built based on
+the subset given. Use -v as well to get an actual list of boards.
+
+Buildman does not store intermediate object files. It optionally copies
+the binary output into a directory when a build is successful (-k). Size
+information is always recorded. It needs a fair bit of disk space to work,
+typically 250MB per thread.
+
+
+Setting up
+----------
+
+#. Get the U-Boot source. You probably already have it, but if not these
+   steps should get you started with a repo and some commits for testing.
+
+   .. code-block:: bash
+
+      cd /path/to/u-boot
+      git clone git://git.denx.de/u-boot.git .
+      git checkout -b my-branch origin/master
+      # Add some commits to the branch, reading for testing
+
+#. Create ~/.buildman to tell buildman where to find tool chains (see
+   buildman_settings_ for details). As an example::
+
+   # Buildman settings file
+
+   [toolchain]
+   root: /
+   rest: /toolchains/*
+   eldk: /opt/eldk-4.2
+   arm: /opt/linaro/gcc-linaro-arm-linux-gnueabihf-4.8-2013.08_linux
+   aarch64: /opt/linaro/gcc-linaro-aarch64-none-elf-4.8-2013.10_linux
+
+   [toolchain-alias]
+   x86: i386
+   blackfin: bfin
+   openrisc: or1k
+
+
+   This selects the available toolchain paths. Add the base directory for
+   each of your toolchains here. Buildman will search inside these directories
+   and also in any '/usr' and '/usr/bin' subdirectories.
+
+   Make sure the tags (here root: rest: and eldk:) are unique.
+
+   The toolchain-alias section indicates that the i386 toolchain should be used
+   to build x86 commits.
+
+   Note that you can also specific exactly toolchain prefixes if you like::
+
+      [toolchain-prefix]
+      arm: /opt/arm-eabi-4.6/bin/arm-eabi-
+
+   or even::
+
+      [toolchain-prefix]
+      arm: /opt/arm-eabi-4.6/bin/arm-eabi-gcc
+
+   This tells buildman that you want to use this exact toolchain for the arm
+   architecture. This will override any toolchains found by searching using the
+   [toolchain] settings.
+
+   Since the toolchain prefix is an explicit request, buildman will report an
+   error if a toolchain is not found with that prefix. The current PATH will be
+   searched, so it is possible to use::
+
+      [toolchain-prefix]
+      arm: arm-none-eabi-
+
+   and buildman will find arm-none-eabi-gcc in /usr/bin if you have it
+   installed.
+
+   Another example::
+
+      [toolchain-wrapper]
+      wrapper: ccache
+
+   This tells buildman to use a compiler wrapper in front of CROSS_COMPILE. In
+   this example, ccache. It doesn't affect the toolchain scan. The wrapper is
+   added when CROSS_COMPILE environtal variable is set. The name in this
+   section is ignored. If more than one line is provided, only the last one
+   is taken.
+
+#. Make sure you have the require Python pre-requisites
+
+   Buildman uses multiprocessing, Queue, shutil, StringIO, ConfigParser and
+   urllib2. These should normally be available, but if you get an error like
+   this then you will need to obtain those modules::
+
+      ImportError: No module named multiprocessing
+
+
+#. Check the available toolchains
+
+   Run this check to make sure that you have a toolchain for every architecture::
+
+      $ ./tools/buildman/buildman --list-tool-chains
+      Scanning for tool chains
+         - scanning prefix '/opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-'
+      Tool chain test:  OK, arch='x86', priority 1
+         - scanning prefix '/opt/arm-eabi-4.6/bin/arm-eabi-'
+      Tool chain test:  OK, arch='arm', priority 1
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/i386-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/i386-linux/bin/i386-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/i386-linux/usr/bin'
+      Tool chain test:  OK, arch='i386', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/aarch64-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/aarch64-linux/usr/bin'
+      Tool chain test:  OK, arch='aarch64', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/microblaze-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin/microblaze-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/microblaze-linux/usr/bin'
+      Tool chain test:  OK, arch='microblaze', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/mips64-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/mips64-linux/bin/mips64-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips64-linux/usr/bin'
+      Tool chain test:  OK, arch='mips64', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/sparc64-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc64-linux/usr/bin'
+      Tool chain test:  OK, arch='sparc64', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/usr/bin'
+      Tool chain test:  OK, arch='arm', priority 3
+      Toolchain '/toolchains/gcc-4.9.0-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc' at priority 3 will be ignored because another toolchain for arch 'arm' has priority 1
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/sparc-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/sparc-linux/bin/sparc-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/sparc-linux/usr/bin'
+      Tool chain test:  OK, arch='sparc', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/mips-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/mips-linux/bin/mips-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/mips-linux/usr/bin'
+      Tool chain test:  OK, arch='mips', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/x86_64-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc'
+               - found '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-x86_64-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/usr/bin'
+      Tool chain test:  OK, arch='x86_64', priority 4
+      Tool chain test:  OK, arch='x86_64', priority 4
+      Toolchain '/toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-x86_64-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'x86_64' has priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/m68k-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/m68k-linux/bin/m68k-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/m68k-linux/usr/bin'
+      Tool chain test:  OK, arch='m68k', priority 4
+         - scanning path '/toolchains/gcc-4.9.0-nolibc/powerpc-linux'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/.'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin'
+               - found '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin/powerpc-linux-gcc'
+            - looking in '/toolchains/gcc-4.9.0-nolibc/powerpc-linux/usr/bin'
+      Tool chain test:  OK, arch='powerpc', priority 4
+         - scanning path '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/.'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin'
+               - found '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin/bfin-uclinux-gcc'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/bfin-uclinux/usr/bin'
+      Tool chain test:  OK, arch='bfin', priority 6
+         - scanning path '/toolchains/gcc-4.6.3-nolibc/sparc-linux'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/.'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin'
+               - found '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin/sparc-linux-gcc'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/sparc-linux/usr/bin'
+      Tool chain test:  OK, arch='sparc', priority 4
+      Toolchain '/toolchains/gcc-4.6.3-nolibc/sparc-linux/bin/sparc-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'sparc' has priority 4
+         - scanning path '/toolchains/gcc-4.6.3-nolibc/mips-linux'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/.'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin'
+               - found '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/mips-linux/usr/bin'
+      Tool chain test:  OK, arch='mips', priority 4
+      Toolchain '/toolchains/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'mips' has priority 4
+         - scanning path '/toolchains/gcc-4.6.3-nolibc/m68k-linux'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/.'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin'
+               - found '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux-gcc'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/m68k-linux/usr/bin'
+      Tool chain test:  OK, arch='m68k', priority 4
+      Toolchain '/toolchains/gcc-4.6.3-nolibc/m68k-linux/bin/m68k-linux-gcc' at priority 4 will be ignored because another toolchain for arch 'm68k' has priority 4
+         - scanning path '/toolchains/gcc-4.6.3-nolibc/powerpc-linux'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/.'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/bin'
+               - found '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc'
+            - looking in '/toolchains/gcc-4.6.3-nolibc/powerpc-linux/usr/bin'
+      Tool chain test:  OK, arch='powerpc', priority 4
+      Tool chain test:  OK, arch='or32', priority 4
+         - scanning path '/'
+            - looking in '/.'
+            - looking in '/bin'
+            - looking in '/usr/bin'
+               - found '/usr/bin/i586-mingw32msvc-gcc'
+               - found '/usr/bin/c89-gcc'
+               - found '/usr/bin/x86_64-linux-gnu-gcc'
+               - found '/usr/bin/gcc'
+               - found '/usr/bin/c99-gcc'
+               - found '/usr/bin/arm-linux-gnueabi-gcc'
+               - found '/usr/bin/aarch64-linux-gnu-gcc'
+               - found '/usr/bin/winegcc'
+               - found '/usr/bin/arm-linux-gnueabihf-gcc'
+      Tool chain test:  OK, arch='i586', priority 11
+      Tool chain test:  OK, arch='c89', priority 11
+      Tool chain test:  OK, arch='x86_64', priority 4
+      Toolchain '/usr/bin/x86_64-linux-gnu-gcc' at priority 4 will be ignored because another toolchain for arch 'x86_64' has priority 4
+      Tool chain test:  OK, arch='sandbox', priority 11
+      Tool chain test:  OK, arch='c99', priority 11
+      Tool chain test:  OK, arch='arm', priority 4
+      Toolchain '/usr/bin/arm-linux-gnueabi-gcc' at priority 4 will be ignored because another toolchain for arch 'arm' has priority 1
+      Tool chain test:  OK, arch='aarch64', priority 4
+      Toolchain '/usr/bin/aarch64-linux-gnu-gcc' at priority 4 will be ignored because another toolchain for arch 'aarch64' has priority 4
+      Tool chain test:  OK, arch='sandbox', priority 11
+      Toolchain '/usr/bin/winegcc' at priority 11 will be ignored because another toolchain for arch 'sandbox' has priority 11
+      Tool chain test:  OK, arch='arm', priority 4
+      Toolchain '/usr/bin/arm-linux-gnueabihf-gcc' at priority 4 will be ignored because another toolchain for arch 'arm' has priority 1
+      List of available toolchains (34):
+      aarch64   : /toolchains/gcc-4.9.0-nolibc/aarch64-linux/bin/aarch64-linux-gcc
+      alpha     : /toolchains/gcc-4.9.0-nolibc/alpha-linux/bin/alpha-linux-gcc
+      am33_2.0  : /toolchains/gcc-4.9.0-nolibc/am33_2.0-linux/bin/am33_2.0-linux-gcc
+      arm       : /opt/arm-eabi-4.6/bin/arm-eabi-gcc
+      bfin      : /toolchains/gcc-4.6.3-nolibc/bfin-uclinux/bin/bfin-uclinux-gcc
+      c89       : /usr/bin/c89-gcc
+      c99       : /usr/bin/c99-gcc
+      frv       : /toolchains/gcc-4.9.0-nolibc/frv-linux/bin/frv-linux-gcc
+      h8300     : /toolchains/gcc-4.9.0-nolibc/h8300-elf/bin/h8300-elf-gcc
+      hppa      : /toolchains/gcc-4.9.0-nolibc/hppa-linux/bin/hppa-linux-gcc
+      hppa64    : /toolchains/gcc-4.9.0-nolibc/hppa64-linux/bin/hppa64-linux-gcc
+      i386      : /toolchains/gcc-4.9.0-nolibc/i386-linux/bin/i386-linux-gcc
+      i586      : /usr/bin/i586-mingw32msvc-gcc
+      ia64      : /toolchains/gcc-4.9.0-nolibc/ia64-linux/bin/ia64-linux-gcc
+      m32r      : /toolchains/gcc-4.9.0-nolibc/m32r-linux/bin/m32r-linux-gcc
+      m68k      : /toolchains/gcc-4.9.0-nolibc/m68k-linux/bin/m68k-linux-gcc
+      microblaze: /toolchains/gcc-4.9.0-nolibc/microblaze-linux/bin/microblaze-linux-gcc
+      mips      : /toolchains/gcc-4.9.0-nolibc/mips-linux/bin/mips-linux-gcc
+      mips64    : /toolchains/gcc-4.9.0-nolibc/mips64-linux/bin/mips64-linux-gcc
+      or32      : /toolchains/gcc-4.5.1-nolibc/or32-linux/bin/or32-linux-gcc
+      powerpc   : /toolchains/gcc-4.9.0-nolibc/powerpc-linux/bin/powerpc-linux-gcc
+      powerpc64 : /toolchains/gcc-4.9.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc
+      ppc64le   : /toolchains/gcc-4.9.0-nolibc/ppc64le-linux/bin/ppc64le-linux-gcc
+      s390x     : /toolchains/gcc-4.9.0-nolibc/s390x-linux/bin/s390x-linux-gcc
+      sandbox   : /usr/bin/gcc
+      sh4       : /toolchains/gcc-4.6.3-nolibc/sh4-linux/bin/sh4-linux-gcc
+      sparc     : /toolchains/gcc-4.9.0-nolibc/sparc-linux/bin/sparc-linux-gcc
+      sparc64   : /toolchains/gcc-4.9.0-nolibc/sparc64-linux/bin/sparc64-linux-gcc
+      tilegx    : /toolchains/gcc-4.6.2-nolibc/tilegx-linux/bin/tilegx-linux-gcc
+      x86       : /opt/gcc-4.6.3-nolibc/x86_64-linux/bin/x86_64-linux-gcc
+      x86_64    : /toolchains/gcc-4.9.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc
+
+
+   You can see that everything is covered, even some strange ones that won't
+   be used (c88 and c99). This is a feature.
+
+
+#. Install new toolchains if needed
+
+   You can download toolchains and update the [toolchain] section of the
+   settings file to find them.
+
+   To make this easier, buildman can automatically download and install
+   toolchains from kernel.org. First list the available architectures::
+
+      $ ./tools/buildman/buildman --fetch-arch list
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.2/
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1/
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.2.4/
+      Available architectures: alpha am33_2.0 arm bfin cris crisv32 frv h8300
+      hppa hppa64 i386 ia64 m32r m68k mips mips64 or32 powerpc powerpc64 s390x sh4
+      sparc sparc64 tilegx x86_64 xtensa
+
+   Then pick one and download it::
+
+      $ ./tools/buildman/buildman --fetch-arch or32
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.3/
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.6.2/
+      Checking: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1/
+      Downloading: https://www.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.1//x86_64-gcc-4.5.1-nolibc_or32-linux.tar.xz
+      Unpacking to: /home/sjg/.buildman-toolchains
+      Testing
+            - looking in '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/.'
+            - looking in '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/bin'
+               - found '/home/sjg/.buildman-toolchains/gcc-4.5.1-nolibc/or32-linux/bin/or32-linux-gcc'
+      Tool chain test:  OK
+
+   Or download them all from kernel.org and move them to /toolchains directory:
+
+   .. code-block:: bash
+
+      ./tools/buildman/buildman --fetch-arch all
+      sudo mkdir -p /toolchains
+      sudo mv ~/.buildman-toolchains/*/* /toolchains/
+
+   For those not available from kernel.org, download from the following links:
+
+   - `Arc Toolchain`_
+   - `Blackfin Toolchain`_
+   - `Nios2 Toolchain`_
+   - `SH Toolchain`_
+
+   Note openrisc kernel.org toolchain is out of date. Download the latest one
+   from `OpenRISC Toolchains`_, e.g. `OpenRISC 4.8.1`_.
+
+   Buildman should now be set up to use your new toolchain.
+
+   At the time of writing, U-Boot has these architectures:
+
+      arc, arm, blackfin, m68k, microblaze, mips, nios2, openrisc
+      powerpc, sandbox, sh, sparc, x86
+
+   Of these, only arc is not available at kernel.org.
+
+
+How to run it
+-------------
+
+First do a dry run using the -n flag: (replace <branch> with a real, local
+branch with a valid upstream):
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman -b <branch> -n
+
+If it can't detect the upstream branch, try checking out the branch, and
+doing something like 'git branch --set-upstream-to upstream/master'
+or something similar. Buildman will try to guess a suitable upstream branch
+if it can't find one (you will see a message like "Guessing upstream as ...").
+You can also use the -c option to manually specify the number of commits to
+build.
+
+As an example::
+
+   Dry run, so not doing much. But I would do this:
+
+   Building 18 commits for 1059 boards (4 threads, 1 job per thread)
+   Build directory: ../lcd9b
+       5bb3505 Merge branch 'master' of git://git.denx.de/u-boot-arm
+       c18f1b4 tegra: Use const for pinmux_config_pingroup/table()
+       2f043ae tegra: Add display support to funcmux
+       e349900 tegra: fdt: Add pwm binding and node
+       424a5f0 tegra: fdt: Add LCD definitions for Tegra
+       0636ccf tegra: Add support for PWM
+       a994fe7 tegra: Add SOC support for display/lcd
+       fcd7350 tegra: Add LCD driver
+       4d46e9d tegra: Add LCD support to Nvidia boards
+       991bd48 arm: Add control over cachability of memory regions
+       54e8019 lcd: Add CONFIG_LCD_ALIGNMENT to select frame buffer alignment
+       d92aff7 lcd: Add support for flushing LCD fb from dcache after update
+       dbd0677 tegra: Align LCD frame buffer to section boundary
+       0cff9b8 tegra: Support control of cache settings for LCD
+       9c56900 tegra: fdt: Add LCD definitions for Seaboard
+       5cc29db lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
+       cac5a23 tegra: Enable display/lcd support on Seaboard
+       49ff541 wip
+
+   Total boards to build for each commit: 1059
+
+This shows that it will build all 1059 boards, using 4 threads (because
+we have a 4-core CPU). Each thread will run with -j1, meaning that each
+make job will use a single CPU. The list of commits to be built helps you
+confirm that things look about right. Notice that buildman has chosen a
+'base' directory for you, immediately above your source tree.
+
+Buildman works entirely inside the base directory, here ../lcd9b,
+creating a working directory for each thread, and creating output
+directories for each commit and board.
+
+
+Suggested Workflow
+------------------
+
+To run the build for real, take off the -n:
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman -b <branch>
+
+Buildman will set up some working directories, and get started. After a
+minute or so it will settle down to a steady pace, with a display like this::
+
+   Building 18 commits for 1059 boards (4 threads, 1 job per thread)
+     528   36  124 /19062    -18374  1:13:30  : SIMPC8313_SP
+
+This means that it is building 19062 board/commit combinations. So far it
+has managed to successfully build 528. Another 36 have built with warnings,
+and 124 more didn't build at all. It has 18374 builds left to complete.
+Buildman expects to complete the process in around an hour and a quarter.
+Use this time to buy a faster computer.
+
+
+To find out how the build went, ask for a summary with -s. You can do this
+either before the build completes (presumably in another terminal) or
+afterwards. Let's work through an example of how this is used::
+
+   $ ./tools/buildman/buildman -b lcd9b -s
+   ...
+   01: Merge branch 'master' of git://git.denx.de/u-boot-arm
+      powerpc:   + galaxy5200_LOWBOOT
+   02: tegra: Use const for pinmux_config_pingroup/table()
+   03: tegra: Add display support to funcmux
+   04: tegra: fdt: Add pwm binding and node
+   05: tegra: fdt: Add LCD definitions for Tegra
+   06: tegra: Add support for PWM
+   07: tegra: Add SOC support for display/lcd
+   08: tegra: Add LCD driver
+   09: tegra: Add LCD support to Nvidia boards
+   10: arm: Add control over cachability of memory regions
+   11: lcd: Add CONFIG_LCD_ALIGNMENT to select frame buffer alignment
+   12: lcd: Add support for flushing LCD fb from dcache after update
+          arm:   + lubbock
+   13: tegra: Align LCD frame buffer to section boundary
+   14: tegra: Support control of cache settings for LCD
+   15: tegra: fdt: Add LCD definitions for Seaboard
+   16: lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
+   17: tegra: Enable display/lcd support on Seaboard
+   18: wip
+
+This shows which commits have succeeded and which have failed. In this case
+the build is still in progress so many boards are not built yet (use -u to
+see which ones). But already we can see a few failures. The galaxy5200_LOWBOOT
+never builds correctly. This could be a problem with our toolchain, or it
+could be a bug in the upstream. The good news is that we probably don't need
+to blame our commits. The bad news is that our commits are not tested on that
+board.
+
+Commit 12 broke lubbock. That's what the '+ lubbock', in red, means. The
+failure is never fixed by a later commit, or you would see lubbock again, in
+green, without the +.
+
+To see the actual error::
+
+   $ ./tools/buildman/buildman -b <branch> -se
+   ...
+   12: lcd: Add support for flushing LCD fb from dcache after update
+          arm:   + lubbock
+   +common/libcommon.o: In function `lcd_sync':
+   +common/lcd.c:120: undefined reference to `flush_dcache_range'
+   +arm-none-linux-gnueabi-ld: BFD (Sourcery G++ Lite 2010q1-202) 2.19.51.20090709 assertion fail /scratch/julian/2010q1-release-linux-lite/obj/binutils-src-2010q1-202-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf32-arm.c:12572
+   +make: *** [build/u-boot] Error 139
+   13: tegra: Align LCD frame buffer to section boundary
+   14: tegra: Support control of cache settings for LCD
+   15: tegra: fdt: Add LCD definitions for Seaboard
+   16: lcd: Add CONFIG_CONSOLE_SCROLL_LINES option to speed console
+   -common/lcd.c:120: undefined reference to `flush_dcache_range'
+   +common/lcd.c:125: undefined reference to `flush_dcache_range'
+   17: tegra: Enable display/lcd support on Seaboard
+   18: wip
+
+So the problem is in lcd.c, due to missing cache operations. This information
+should be enough to work out what that commit is doing to break these
+boards. (In this case pxa did not have cache operations defined).
+
+Note that if there were other boards with errors, the above command would
+show their errors also. Each line is shown only once. So if lubbock and snow
+produce the same error, we just see::
+
+   12: lcd: Add support for flushing LCD fb from dcache after update
+          arm:   + lubbock snow
+   +common/libcommon.o: In function `lcd_sync':
+   +common/lcd.c:120: undefined reference to `flush_dcache_range'
+   +arm-none-linux-gnueabi-ld: BFD (Sourcery G++ Lite 2010q1-202) 2.19.51.20090709 assertion fail /scratch/julian/2010q1-release-linux-lite/obj/binutils-src-2010q1-202-arm-none-linux-gnueabi-i686-pc-linux-gnu/bfd/elf32-arm.c:12572
+   +make: *** [build/u-boot] Error 139
+
+But if you did want to see just the errors for lubbock, use:
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman -b <branch> -se lubbock
+
+If you see error lines marked with '-', that means that the errors were fixed
+by that commit. Sometimes commits can be in the wrong order, so that a
+breakage is introduced for a few commits and fixed by later commits. This
+shows up clearly with buildman. You can then reorder the commits and try
+again.
+
+At commit 16, the error moves: you can see that the old error at line 120
+is fixed, but there is a new one at line 126. This is probably only because
+we added some code and moved the broken line further down the file.
+
+As mentioned, if many boards have the same error, then -e will display the
+error only once. This makes the output as concise as possible. To see which
+boards have each error, use -l. So it is safe to omit the board name - you
+will not get lots of repeated output for every board.
+
+Buildman tries to distinguish warnings from errors, and shows warning lines
+separately with a 'w' prefix. Warnings introduced show as yellow. Warnings
+fixed show as cyan.
+
+The full build output in this case is available in::
+
+   ../lcd9b/12_of_18_gd92aff7_lcd--Add-support-for/lubbock/
+
+Files:
+
+done
+   Indicates the build was done, and holds the return code from make. This is 0
+   for a good build, typically 2 for a failure.
+
+err
+   Output from stderr, if any. Errors and warnings appear here.
+
+log
+   Output from stdout. Normally there isn't any since buildman runs in silent
+   mode. Use -V to force a verbose build (this passes V=1 to 'make')
+
+toolchain
+   Shows information about the toolchain used for the build.
+
+sizes
+   Shows image size information.
+
+It is possible to get the build binary output there also. Use the -k option
+for this. In that case you will also see some output files, like:
+
+- System.map
+- toolchain
+- u-boot
+- u-boot.bin
+- u-boot.map
+- autoconf.mk
+- SPL/TPL versions like u-boot-spl and u-boot-spl.bin if available
+
+
+Checking Image Sizes
+--------------------
+
+A key requirement for U-Boot is that you keep code/data size to a minimum.
+Where a new feature increases this noticeably it should normally be put
+behind a CONFIG flag so that boards can leave it disabled and keep the image
+size more or less the same with each new release.
+
+To check the impact of your commits on image size, use -S. For example::
+
+   $ ./tools/buildman/buildman -b us-x86 -sS
+   Summary of 10 commits for 1066 boards (4 threads, 1 job per thread)
+   01: MAKEALL: add support for per architecture toolchains
+   02: x86: Add function to get top of usable ram
+          x86: (for 1/3 boards)  text -272.0  rodata +41.0
+   03: x86: Add basic cache operations
+   04: x86: Permit bootstage and timer data to be used prior to relocation
+          x86: (for 1/3 boards)  data +16.0
+   05: x86: Add an __end symbol to signal the end of the U-Boot binary
+          x86: (for 1/3 boards)  text +76.0
+   06: x86: Rearrange the output input to remove BSS
+          x86: (for 1/3 boards)  bss -2140.0
+   07: x86: Support relocation of FDT on start-up
+          x86: +   coreboot-x86
+   08: x86: Add error checking to x86 relocation code
+   09: x86: Adjust link device tree include file
+   10: x86: Enable CONFIG_OF_CONTROL on coreboot
+
+
+You can see that image size only changed on x86, which is good because this
+series is not supposed to change any other board. From commit 7 onwards the
+build fails so we don't get code size numbers. The numbers are fractional
+because they are an average of all boards for that architecture. The
+intention is to allow you to quickly find image size problems introduced by
+your commits.
+
+Note that the 'text' region and 'rodata' are split out. You should add the
+two together to get the total read-only size (reported as the first column
+in the output from binutil's 'size' utility).
+
+A useful option is --step which lets you skip some commits. For example
+--step 2 will show the image sizes for only every 2nd commit (so it will
+compare the image sizes of the 1st, 3rd, 5th... commits). You can also use
+--step 0 which will compare only the first and last commits. This is useful
+for an overview of how your entire series affects code size. It will build
+only the upstream commit and your final branch commit.
+
+You can also use -d to see a detailed size breakdown for each board. This
+list is sorted in order from largest growth to largest reduction.
+
+It is even possible to go a little further with the -B option (--bloat). This
+shows where U-Boot has bloated, breaking the size change down to the function
+level. Example output is below::
+
+   $ ./tools/buildman/buildman -b us-mem4 -sSdB
+   ...
+   19: Roll crc32 into hash infrastructure
+          arm: (for 10/10 boards)  all -143.4  bss +1.2  data -4.8  rodata -48.2 text -91.6
+               paz00          :  all +23  bss -4  rodata -29  text +56
+                  u-boot: add: 1/0, grow: 3/-2 bytes: 168/-104 (64)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    ext4fs_read_file                           540     568     +28
+                    insert_var_value_sub                       688     692      +4
+                    run_list_real                             1996    1992      -4
+                    do_mem_crc                                 168      68    -100
+               trimslice      :  all -9  bss +16  rodata -29  text +4
+                  u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    ext4fs_iterate_dir                         672     668      -4
+                    ext4fs_read_file                           568     548     -20
+                    do_mem_crc                                 168      68    -100
+               whistler       :  all -9  bss +16  rodata -29  text +4
+                  u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    ext4fs_iterate_dir                         672     668      -4
+                    ext4fs_read_file                           568     548     -20
+                    do_mem_crc                                 168      68    -100
+               seaboard       :  all -9  bss -28  rodata -29  text +48
+                  u-boot: add: 1/0, grow: 3/-2 bytes: 160/-104 (56)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    ext4fs_read_file                           548     568     +20
+                    run_list_real                             1996    2000      +4
+                    do_nandboot                                760     756      -4
+                    do_mem_crc                                 168      68    -100
+               colibri_t20    :  all -9  rodata -29  text +20
+                  u-boot: add: 1/0, grow: 2/-3 bytes: 140/-112 (28)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    read_abs_bbt                               204     208      +4
+                    do_nandboot                                760     756      -4
+                    ext4fs_read_file                           576     568      -8
+                    do_mem_crc                                 168      68    -100
+               ventana        :  all -37  bss -12  rodata -29  text +4
+                  u-boot: add: 1/0, grow: 1/-3 bytes: 136/-124 (12)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    ext4fs_iterate_dir                         672     668      -4
+                    ext4fs_read_file                           568     548     -20
+                    do_mem_crc                                 168      68    -100
+               harmony        :  all -37  bss -16  rodata -29  text +8
+                  u-boot: add: 1/0, grow: 2/-3 bytes: 140/-124 (16)
+                    function                                   old     new   delta
+                    hash_command                                80     160     +80
+                    crc32_wd_buf                                 -      56     +56
+                    nand_write_oob_syndrome                    428     432      +4
+                    ext4fs_iterate_dir                         672     668      -4
+                    ext4fs_read_file                           568     548     -20
+                    do_mem_crc                                 168      68    -100
+               medcom-wide    :  all -417  bss +28  data -16  rodata -93  text -336
+                  u-boot: add: 1/-1, grow: 1/-2 bytes: 88/-376 (-288)
+                    function                                   old     new   delta
+                    crc32_wd_buf                                 -      56     +56
+                    do_fat_read_at                            2872    2904     +32
+                    hash_algo                                   16       -     -16
+                    do_mem_crc                                 168      68    -100
+                    hash_command                               420     160    -260
+               tec            :  all -449  bss -4  data -16  rodata -93  text -336
+                  u-boot: add: 1/-1, grow: 1/-2 bytes: 88/-376 (-288)
+                    function                                   old     new   delta
+                    crc32_wd_buf                                 -      56     +56
+                    do_fat_read_at                            2872    2904     +32
+                    hash_algo                                   16       -     -16
+                    do_mem_crc                                 168      68    -100
+                    hash_command                               420     160    -260
+               plutux         :  all -481  bss +16  data -16  rodata -93  text -388
+                  u-boot: add: 1/-1, grow: 1/-3 bytes: 68/-408 (-340)
+                    function                                   old     new   delta
+                    crc32_wd_buf                                 -      56     +56
+                    do_load_serial_bin                        1688    1700     +12
+                    hash_algo                                   16       -     -16
+                    do_fat_read_at                            2904    2872     -32
+                    do_mem_crc                                 168      68    -100
+                    hash_command                               420     160    -260
+      powerpc: (for 5/5 boards)  all +37.4  data -3.2  rodata -41.8  text +82.4
+               MPC8610HPCD    :  all +55  rodata -29  text +84
+                  u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
+                    function                                   old     new   delta
+                    hash_command                                 -     176    +176
+                    do_mem_crc                                 184      88     -96
+               MPC8641HPCN    :  all +55  rodata -29  text +84
+                  u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
+                    function                                   old     new   delta
+                    hash_command                                 -     176    +176
+                    do_mem_crc                                 184      88     -96
+               MPC8641HPCN_36BIT:  all +55  rodata -29  text +84
+                  u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
+                    function                                   old     new   delta
+                    hash_command                                 -     176    +176
+                    do_mem_crc                                 184      88     -96
+               sbc8641d       :  all +55  rodata -29  text +84
+                  u-boot: add: 1/0, grow: 0/-1 bytes: 176/-96 (80)
+                    function                                   old     new   delta
+                    hash_command                                 -     176    +176
+                    do_mem_crc                                 184      88     -96
+               xpedite517x    :  all -33  data -16  rodata -93  text +76
+                  u-boot: add: 1/-1, grow: 0/-1 bytes: 176/-112 (64)
+                    function                                   old     new   delta
+                    hash_command                                 -     176    +176
+                    hash_algo                                   16       -     -16
+                    do_mem_crc                                 184      88     -96
+   ...
+
+
+This shows that commit 19 has reduced codesize for arm slightly and increased
+it for powerpc. This increase was offset in by reductions in rodata and
+data/bss.
+
+Shown below the summary lines are the sizes for each board. Below each board
+are the sizes for each function. This information starts with:
+
+add
+   number of functions added / removed
+
+grow
+   number of functions which grew / shrunk
+
+bytes
+   number of bytes of code added to / removed from all functions, plus the total
+   byte change in brackets
+
+The change seems to be that hash_command() has increased by more than the
+do_mem_crc() function has decreased. The function sizes typically add up to
+roughly the text area size, but note that every read-only section except
+rodata is included in 'text', so the function total does not exactly
+correspond.
+
+It is common when refactoring code for the rodata to decrease as the text size
+increases, and vice versa.
+
+
+.. _buildman_settings:
+
+The .buildman settings file
+---------------------------
+
+The .buildman file provides information about the available toolchains and
+also allows build flags to be passed to 'make'. It consists of several
+sections, with the section name in square brackets. Within each section are
+a set of (tag, value) pairs.
+
+'[toolchain]' section
+    This lists the available toolchains. The tag here doesn't matter, but
+    make sure it is unique. The value is the path to the toolchain. Buildman
+    will look in that path for a file ending in 'gcc'. It will then execute
+    it to check that it is a C compiler, passing only the --version flag to
+    it. If the return code is 0, buildman assumes that it is a valid C
+    compiler. It uses the first part of the name as the architecture and
+    strips off the last part when setting the CROSS_COMPILE environment
+    variable (parts are delimited with a hyphen).
+
+    For example powerpc-linux-gcc will be noted as a toolchain for 'powerpc'
+    and CROSS_COMPILE will be set to powerpc-linux- when using it.
+
+'[toolchain-alias]' section
+    This converts toolchain architecture names to U-Boot names. For example,
+    if an x86 toolchains is called i386-linux-gcc it will not normally be
+    used for architecture 'x86'. Adding 'x86: i386 x86_64' to this section
+    will tell buildman that the i386 and x86_64 toolchains can be used for
+    the x86 architecture.
+
+'[make-flags]' section
+    U-Boot's build system supports a few flags (such as BUILD_TAG) which
+    affect the build product. These flags can be specified in the buildman
+    settings file. They can also be useful when building U-Boot against other
+    open source software.
+
+    [make-flags]
+    at91-boards=ENABLE_AT91_TEST=1
+    snapper9260=${at91-boards} BUILD_TAG=442
+    snapper9g45=${at91-boards} BUILD_TAG=443
+
+    This will use 'make ENABLE_AT91_TEST=1 BUILD_TAG=442' for snapper9260
+    and 'make ENABLE_AT91_TEST=1 BUILD_TAG=443' for snapper9g45. A special
+    variable ${target} is available to access the target name (snapper9260
+    and snapper9g20 in this case). Variables are resolved recursively. Note
+    that variables can only contain the characters A-Z, a-z, 0-9, hyphen (-)
+    and underscore (_).
+
+    It is expected that any variables added are dealt with in U-Boot's
+    config.mk file and documented in the README.
+
+    Note that you can pass ad-hoc options to the build using environment
+    variables, for example:
+
+       SOME_OPTION=1234 ./tools/buildman/buildman my_board
+
+
+Quick Sanity Check
+------------------
+
+If you have made changes and want to do a quick sanity check of the
+currently checked-out source, run buildman without the -b flag. This will
+build the selected boards and display build status as it runs (i.e. -v is
+enabled automatically). Use -e to see errors/warnings as well.
+
+
+Building Ranges
+---------------
+
+You can build a range of commits by specifying a range instead of a branch
+when using the -b flag. For example::
+
+    buildman -b upstream/master..us-buildman
+
+will build commits in us-buildman that are not in upstream/master.
+
+
+Building Faster
+---------------
+
+By default, buildman doesn't execute 'make mrproper' prior to building the
+first commit for each board. This reduces the amount of work 'make' does, and
+hence speeds up the build. To force use of 'make mrproper', use -the -m flag.
+This flag will slow down any buildman invocation, since it increases the amount
+of work done on any build.
+
+One possible application of buildman is as part of a continual edit, build,
+edit, build, ... cycle; repeatedly applying buildman to the same change or
+series of changes while making small incremental modifications to the source
+each time. This provides quick feedback regarding the correctness of recent
+modifications. In this scenario, buildman's default choice of build directory
+causes more build work to be performed than strictly necessary.
+
+By default, each buildman thread uses a single directory for all builds. When a
+thread builds multiple boards, the configuration built in this directory will
+cycle through various different configurations, one per board built by the
+thread. Variations in the configuration will force a rebuild of affected source
+files when a thread switches between boards. Ideally, such buildman-induced
+rebuilds would not happen, thus allowing the build to operate as efficiently as
+the build system and source changes allow. buildman's -P flag may be used to
+enable this; -P causes each board to be built in a separate (board-specific)
+directory, thus avoiding any buildman-induced configuration changes in any
+build directory.
+
+U-Boot's build system embeds information such as a build timestamp into the
+final binary. This information varies each time U-Boot is built. This causes
+various files to be rebuilt even if no source changes are made, which in turn
+requires that the final U-Boot binary be re-linked. This unnecessary work can
+be avoided by turning off the timestamp feature. This can be achieved by
+setting the SOURCE_DATE_EPOCH environment variable to 0.
+
+Combining all of these options together yields the command-line shown below.
+This will provide the quickest possible feedback regarding the current content
+of the source tree, thus allowing rapid tested evolution of the code::
+
+    SOURCE_DATE_EPOCH=0 ./tools/buildman/buildman -P tegra
+
+
+Checking configuration
+----------------------
+
+A common requirement when converting CONFIG options to Kconfig is to check
+that the effective configuration has not changed due to the conversion.
+Buildman supports this with the -K option, used after a build. This shows
+differences in effective configuration between one commit and the next.
+
+For example::
+
+    $ buildman -b kc4 -sK
+    ...
+    43: Convert CONFIG_SPL_USBETH_SUPPORT to Kconfig
+    arm:
+    + u-boot.cfg: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_NET=1
+    + u-boot-spl.cfg: CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1
+    + all: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1 CONFIG_SPL_NET=1
+    am335x_evm_usbspl :
+    + u-boot.cfg: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_NET=1
+    + u-boot-spl.cfg: CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1
+    + all: CONFIG_SPL_ENV_SUPPORT=1 CONFIG_SPL_MMC=1 CONFIG_SPL_NAND_SUPPORT=1 CONFIG_SPL_NET=1
+    44: Convert CONFIG_SPL_USB_HOST to Kconfig
+    ...
+
+This shows that commit 44 enabled three new options for the board
+am335x_evm_usbspl which were not enabled in commit 43. There is also a
+summary for 'arm' showing all the changes detected for that architecture.
+In this case there is only one board with changes, so 'arm' output is the
+same as 'am335x_evm_usbspl'/
+
+The -K option uses the u-boot.cfg, spl/u-boot-spl.cfg and tpl/u-boot-tpl.cfg
+files which are produced by a build. If all you want is to check the
+configuration you can in fact avoid doing a full build, using -D. This tells
+buildman to configuration U-Boot and create the .cfg files, but not actually
+build the source. This is 5-10 times faster than doing a full build.
+
+By default buildman considers the follow two configuration methods
+equivalent::
+
+   #define CONFIG_SOME_OPTION
+
+   CONFIG_SOME_OPTION=y
+
+The former would appear in a header filer and the latter in a defconfig
+file. The achieve this, buildman considers 'y' to be '1' in configuration
+variables. This avoids lots of useless output when converting a CONFIG
+option to Kconfig. To disable this behaviour, use --squash-config-y.
+
+
+Checking the environment
+------------------------
+
+When converting CONFIG options which manipulate the default environment,
+a common requirement is to check that the default environment has not
+changed due to the conversion. Buildman supports this with the -U option,
+used after a build. This shows differences in the default environment
+between one commit and the next.
+
+For example::
+
+   $ buildman -b squash brppt1 -sU
+   Summary of 2 commits for 3 boards (3 threads, 3 jobs per thread)
+   01: Migrate bootlimit to Kconfig
+   02: Squashed commit of the following:
+      c brppt1_mmc: altbootcmd=mmc dev 1; run mmcboot0; -> mmc dev 1; run mmcboot0
+      c brppt1_spi: altbootcmd=mmc dev 1; run mmcboot0; -> mmc dev 1; run mmcboot0
+      + brppt1_nand: altbootcmd=run usbscript
+      - brppt1_nand:  altbootcmd=run usbscript
+   (no errors to report)
+
+This shows that commit 2 modified the value of 'altbootcmd' for 'brppt1_mmc'
+and 'brppt1_spi', removing a trailing semicolon. 'brppt1_nand' gained an a
+value for 'altbootcmd', but lost one for ' altbootcmd'.
+
+The -U option uses the u-boot.env files which are produced by a build.
+
+
+Building with clang
+-------------------
+
+To build with clang (sandbox only), use the -O option to override the
+toolchain. For example:
+
+.. code-block:: bash
+
+   buildman -O clang-7 --board sandbox
+
+
+Doing a simple build
+--------------------
+
+In some cases you just want to build a single board and get the full output, use
+the -w option, for example:
+
+.. code-block:: bash
+
+   buildman -o /tmp/build --board sandbox -w
+
+This will write the full build into /tmp/build including object files. You must
+specify the output directory with -o when using -w.
+
+
+Support for IDEs (Integrated Development Environments)
+------------------------------------------------------
+
+Normally buildman summarises the output and shows information indicating the
+meaning of each line of output. For example a '+' symbol appears at the start of
+each error line. Also, buildman prints information about what it is about to do,
+along with a summary at the end.
+
+When using buildman from an IDE, it is helpful to drop this behaviour. Use the
+-I/--ide option for that. You might find -W helpful also so that warnings do
+not cause the build to fail:
+
+.. code-block:: bash
+
+   buildman -o /tmp/build --board sandbox -wWI
+
+
+Changing the configuration
+--------------------------
+
+Sometimes it is useful to change the CONFIG options for a build on the fly. This
+can be used to build a board (or multiple) with a few changes to see the impact.
+The -a option supports this:
+
+.. code-block:: bash
+
+   -a <cfg>
+
+where <cfg> is a CONFIG option (with or without the `CONFIG_` prefix) to enable.
+For example:
+
+.. code-block:: bash
+
+    buildman -a CMD_SETEXPR_FMT
+
+will build with CONFIG_CMD_SETEXPR_FMT enabled.
+
+You can disable options by preceding them with tilde (~). You can specify the
+-a option multiple times:
+
+.. code-block:: bash
+
+    buildman -a CMD_SETEXPR_FMT -a ~CMDLINE
+
+Some options have values, in which case you can change them:
+
+.. code-block:: bash
+
+    buildman -a 'BOOTCOMMAND="echo hello"' CONFIG_SYS_LOAD_ADDR=0x1000
+
+Note that you must put quotes around string options and the whole thing must be
+in single quotes, to make sure the shell leave it alone.
+
+If you try to set an option that does not exist, or that cannot be changed for
+some other reason (e.g. it is 'selected' by another option), then buildman
+shows an error::
+
+   $ buildman --board sandbox -a FRED
+   Building current source for 1 boards (1 thread, 32 jobs per thread)
+       0    0    0 /1       -1      (starting)errs
+   Some CONFIG adjustments did not take effect. This may be because
+   the request CONFIGs do not exist or conflict with others.
+
+   Failed adjustments:
+
+   FRED                  Missing expected line: CONFIG_FRED=y
+
+
+One major caveat with this feature with branches (-b) is that buildman does not
+name the output directories differently when you change the configuration, so
+doing the same build again with different configuration will not trigger a
+rebuild. You can use -f to work around that.
+
+
+Other options
+-------------
+
+Buildman has various other command-line options. Try --help to see them.
+
+To find out what toolchain prefix buildman will use for a build, use the -A
+option.
+
+To request that compiler warnings be promoted to errors, use -E. This passes the
+-Werror flag to the compiler. Note that the build can still produce warnings
+with -E, e.g. the migration warnings::
+
+   --------------------- WARNING ----------------------
+   This board does not use CONFIG_DM_MMC. Please update
+   ...
+   ----------------------------------------------------
+
+When doing builds, Buildman's return code will reflect the overall result::
+
+    0 (success)     No errors or warnings found
+    100             Errors found
+    101             Warnings found (only if no -W)
+
+You can use -W to tell Buildman to return 0 (success) instead of 101 when
+warnings are found. Note that it can be useful to combine -E and -W. This means
+that all compiler warnings will produce failures (code 100) and all other
+warnings will produce success (since 101 is changed to 0).
+
+If there are both warnings and errors, errors win, so buildman returns 100.
+
+The -y option is provided (for use with -s) to ignore the bountiful device-tree
+warnings. Similarly, -Y tells buildman to ignore the migration warnings.
+
+Sometimes you might get an error in a thread that is not handled by buildman,
+perhaps due to a failure of a tool that it calls. You might see the output, but
+then buildman hangs. Failing to handle any eventuality is a bug in buildman and
+should be reported. But you can use -T0 to disable threading and hopefully
+figure out the root cause of the build failure.
+
+Build summary
+-------------
+
+When buildman finishes it shows a summary, something like this::
+
+    Completed: 5 total built, duration 0:00:21, rate 0.24
+
+This shows that a total of 5 builds were done across all selected boards, it
+took 21 seconds and the builds happened at the rate of 0.24 per second. The
+latter number depends on the speed of your machine and the efficiency of the
+U-Boot build.
+
+
+How to change from MAKEALL
+--------------------------
+
+Buildman includes most of the features of MAKEALL and is generally faster
+and easier to use. In particular it builds entire branches: if a particular
+commit introduces an error in a particular board, buildman can easily show
+you this, even if a later commit fixes that error.
+
+The reasons to deprecate MAKEALL are:
+- We don't want to maintain two build systems
+- Buildman is typically faster
+- Buildman has a lot more features
+
+But still, many people will be sad to lose MAKEALL. If you are used to
+MAKEALL, here are a few pointers.
+
+First you need to set up your tool chains - see the 'Setting up' section
+for details. Once you have your required toolchain(s) detected then you are
+ready to go.
+
+To build the current source tree, run buildman without a -b flag:
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman <list of things to build>
+
+This will build the current source tree for the given boards and display
+the results and errors.
+
+However buildman usually works on entire branches, and for that you must
+specify a board flag:
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman -b <branch_name> <list of things to build>
+
+followed by (afterwards, or perhaps concurrently in another terminal):
+
+.. code-block:: bash
+
+   ./tools/buildman/buildman -b <branch_name> -s <list of things to build>
+
+to see the results of the build. Rather than showing you all the output,
+buildman just shows a summary, with red indicating that a commit introduced
+an error and green indicating that a commit fixed an error. Use the -e
+flag to see the full errors and -l to see which boards caused which errors.
+
+If you really want to see build results as they happen, use -v when doing a
+build (and -e to see the errors/warnings too).
+
+You don't need to stick around on that branch while buildman is running. It
+checks out its own copy of the source code, so you can change branches,
+add commits, etc. without affecting the build in progress.
+
+The <list of things to build> can include board names, architectures or the
+like. There are no flags to disambiguate since ambiguities are rare. Using
+the examples from MAKEALL:
+
+Examples::
+
+  - build all Power Architecture boards:
+      MAKEALL -a powerpc
+      MAKEALL --arch powerpc
+      MAKEALL powerpc
+          ** buildman -b <branch> powerpc
+  - build all PowerPC boards manufactured by vendor "esd":
+      MAKEALL -a powerpc -v esd
+          ** buildman -b <branch> esd
+  - build all PowerPC boards manufactured either by "keymile" or "siemens":
+      MAKEALL -a powerpc -v keymile -v siemens
+          ** buildman -b <branch> keymile siemens
+  - build all Freescale boards with MPC83xx CPUs, plus all 4xx boards:
+      MAKEALL -c mpc83xx -v freescale 4xx
+          ** buildman -b <branch> mpc83xx freescale 4xx
+
+Buildman automatically tries to use all the CPUs in your machine. If you
+are building a lot of boards it will use one thread for every CPU core
+it detects in your machine. This is like MAKEALL's BUILD_NBUILDS option.
+You can use the -T flag to change the number of threads. If you are only
+building a few boards, buildman will automatically run make with the -j
+flag to increase the number of concurrent make tasks. It isn't normally
+that helpful to fiddle with this option, but if you use the BUILD_NCPUS
+option in MAKEALL then -j is the equivalent in buildman.
+
+Buildman puts its output in ../<branch_name> by default but you can change
+this with the -o option. Buildman normally does out-of-tree builds: use -i
+to disable that if you really want to. But be careful that once you have
+used -i you pollute buildman's copies of the source tree, and you will need
+to remove the build directory (normally ../<branch_name>) to run buildman
+in normal mode (without -i).
+
+Buildman doesn't keep the output result normally, but use the -k option to
+do this.
+
+Please read 'Theory of Operation' a few times as it will make a lot of
+things clearer.
+
+Some options you might like are::
+
+   -B shows which functions are growing/shrinking in which commit - great
+        for finding code bloat.
+   -S shows image sizes for each commit (just an overall summary)
+   -u shows boards that you haven't built yet
+   --step 0 will build just the upstream commit and the last commit of your
+        branch. This is often a quick sanity check that your branch doesn't
+        break anything. But note this does not check bisectability!
+
+
+Using boards.cfg
+----------------
+
+This file is no-longer needed by buildman but it is still generated in the
+working directory. This helps avoid a delay on every build, since scanning all
+the Kconfig files takes a few seconds. Use the -R flag to force regeneration
+of the file - in that case buildman exits after writing the file. with exit code
+2 if there was an error in the maintainer files.
+
+You should use 'buildman -nv <criteria>' instead of greoing the boards.cfg file,
+since it may be dropped altogether in future.
+
+
+TODO
+----
+
+Many improvements have been made over the years. There is still quite a bit of
+scope for more though, e.g.:
+
+- easier access to log files
+- 'hunting' for problems, perhaps by building a few boards for each arch, or
+  checking commits for changed files and building only boards which use those
+  files
+
+
+Credits
+-------
+
+Thanks to Grant Grundler <grundler@chromium.org> for his ideas for improving
+the build speed by building all commits for a board instead of the other
+way around.
+
+.. _`Arc Toolchain`: https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2016.09-release/arc_gnu_2016.09_prebuilt_uclibc_le_archs_linux_install.tar.gz
+.. _`Blackfin Toolchain`: http://sourceforge.net/projects/adi-toolchain/files/blackfin-toolchain-elf-gcc-4.5-2014R1_45-RC2.x86_64.tar.bz2
+.. _`Nios2 Toolchain`: http://sourcery.mentor.com/public/gnu_toolchain/nios2-linux-gnu/sourceryg++-2015.11-27-nios2-linux-gnu-i686-pc-linux-gnu.tar.bz2
+.. _`SH Toolchain`: http://sourcery.mentor.com/public/gnu_toolchain/sh-linux-gnu/renesas-4.4-200-sh-linux-gnu-i686-pc-linux-gnu.tar.bz2
+.. _`OpenRISC Toolchains`: http://opencores.org/or1k/OpenRISC_GNU_tool_chain#Prebuilt_versions
+.. _`OpenRISC 4.8.1`: ftp://ocuser:ocuser@openrisc.opencores.org/toolchain/gcc-or1k-elf-4.8.1-x86.tar.bz2
+
+.. sectionauthor:: Simon Glass
+.. sectionauthor:: Copyright (c) 2013 The Chromium OS Authors.
+.. sectionauthor:: sjg@chromium.org
+.. Halloween 2012
+.. Updated 12-12-12
+.. Updated 23-02-13
+.. Updated 09-04-20
diff --git a/tools/buildman/control.py b/tools/buildman/control.py
index 0c75466fbd3..377b580b253 100644
--- a/tools/buildman/control.py
+++ b/tools/buildman/control.py
@@ -136,8 +136,8 @@ def DoBuildman(options, args, toolchains=None, make_func=None, brds=None,
 
     if options.full_help:
         tools.print_full_help(
-            os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])), 'README')
-        )
+            os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])),
+                         'README.rst'))
         return 0
 
     gitutil.setup()
diff --git a/tools/buildman/func_test.py b/tools/buildman/func_test.py
index f12e9966349..b4f3b46fcb1 100644
--- a/tools/buildman/func_test.py
+++ b/tools/buildman/func_test.py
@@ -249,7 +249,7 @@ class TestFunctional(unittest.TestCase):
     def testFullHelp(self):
         command.test_result = None
         result = self._RunBuildman('-H')
-        help_file = os.path.join(self._buildman_dir, 'README')
+        help_file = os.path.join(self._buildman_dir, 'README.rst')
         # Remove possible extraneous strings
         extra = '::::::::::::::\n' + help_file + '\n::::::::::::::\n'
         gothelp = result.stdout.replace(extra, '')
@@ -260,7 +260,7 @@ class TestFunctional(unittest.TestCase):
     def testHelp(self):
         command.test_result = None
         result = self._RunBuildman('-h')
-        help_file = os.path.join(self._buildman_dir, 'README')
+        help_file = os.path.join(self._buildman_dir, 'README.rst')
         self.assertTrue(len(result.stdout) > 1000)
         self.assertEqual(0, len(result.stderr))
         self.assertEqual(0, result.return_code)
