From patchwork Mon Sep 12 22:04:23 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Glass X-Patchwork-Id: 114422 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from theia.denx.de (theia.denx.de [85.214.87.163]) by ozlabs.org (Postfix) with ESMTP id DBF89B6FA1 for ; Tue, 13 Sep 2011 08:05:32 +1000 (EST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 4D08D28278; Tue, 13 Sep 2011 00:05:28 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BpVcOtJkMF1U; Tue, 13 Sep 2011 00:05:28 +0200 (CEST) Received: from theia.denx.de (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 5C6C128257; Tue, 13 Sep 2011 00:05:18 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by theia.denx.de (Postfix) with ESMTP id 5125228257 for ; Tue, 13 Sep 2011 00:05:15 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at theia.denx.de Received: from theia.denx.de ([127.0.0.1]) by localhost (theia.denx.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YXkBOp8rD8bE for ; Tue, 13 Sep 2011 00:05:10 +0200 (CEST) X-policyd-weight: NOT_IN_SBL_XBL_SPAMHAUS=-1.5 NOT_IN_SPAMCOP=-1.5 NOT_IN_BL_NJABL=-1.5 (only DNSBL check requested) Received: from smtp-out.google.com (smtp-out.google.com [74.125.121.67]) by theia.denx.de (Postfix) with ESMTPS id B0D7328263 for ; Tue, 13 Sep 2011 00:05:05 +0200 (CEST) Received: from wpaz5.hot.corp.google.com (wpaz5.hot.corp.google.com [172.24.198.69]) by smtp-out.google.com with ESMTP id p8CM4sYG005764; Mon, 12 Sep 2011 15:04:54 -0700 Received: from sglass.mtv.corp.google.com (sglass.mtv.corp.google.com [172.22.72.144]) by wpaz5.hot.corp.google.com with ESMTP id p8CM4qDo017988; Mon, 12 Sep 2011 15:04:52 -0700 Received: by sglass.mtv.corp.google.com (Postfix, from userid 121222) id E634214077E; Mon, 12 Sep 2011 15:04:51 -0700 (PDT) From: Simon Glass To: U-Boot Mailing List Date: Mon, 12 Sep 2011 15:04:23 -0700 Message-Id: <1315865067-1443-3-git-send-email-sjg@chromium.org> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1315865067-1443-1-git-send-email-sjg@chromium.org> References: <1315865067-1443-1-git-send-email-sjg@chromium.org> X-System-Of-Record: true Cc: Grant Likely , Tom Warren Subject: [U-Boot] [RFC PATCH v2 2/6] fdt: Add support for embedded device tree (CONFIG_OF_EMBED) X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.9 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de This new option allows U-Boot to embed a binary device tree into its image to allow run-time control of peripherals. This device tree is for U-Boot's own use and is not necessarily the same one as is passed to the kernel. The device tree compiler output should be placed in the $(obj) rooted tree. Since $(OBJCOPY) insists on adding the path to the generated symbol names, to ensure consistency it should be invoked from the directory where the .dtb file is located and given the input file name without the path. This commit contains my entry for the ugliest Makefile / shell interaction competition. Signed-off-by: Simon Glass --- Makefile | 4 ++ README | 11 +++++- config.mk | 1 + dts/Makefile | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/common.h | 1 + 5 files changed, 115 insertions(+), 2 deletions(-) create mode 100644 dts/Makefile diff --git a/Makefile b/Makefile index d5a1f0a..658a622 100644 --- a/Makefile +++ b/Makefile @@ -224,6 +224,9 @@ endif ifeq ($(CPU),ixp) LIBS += arch/arm/cpu/ixp/npe/libnpe.o endif +ifeq ($(CONFIG_OF_EMBED),y) +LIBS += dts/libdts.o +endif LIBS += arch/$(ARCH)/lib/lib$(ARCH).o LIBS += fs/cramfs/libcramfs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o \ fs/reiserfs/libreiserfs.o fs/ext2/libext2fs.o fs/yaffs2/libyaffs2.o \ @@ -962,6 +965,7 @@ clobber: clean @rm -f $(obj)u-boot.kwb @rm -f $(obj)u-boot.imx @rm -f $(obj)u-boot.ubl + @rm -f $(obj)u-boot.dtb @rm -f $(obj)tools/{env/crc32.c,inca-swap-bytes} @rm -f $(obj)arch/powerpc/cpu/mpc824x/bedbug_603e.c @rm -fr $(obj)include/asm/proc $(obj)include/asm/arch $(obj)include/asm diff --git a/README b/README index 812805f..5a2f060 100644 --- a/README +++ b/README @@ -803,8 +803,15 @@ The following options need to be configured: experimental and only available on a few boards. The device tree is available in the global data as gd->blob. - U-Boot needs to get its device tree from somewhere. This will - be enabled in a future patch. + U-Boot needs to get its device tree from somewhere. At present + the only way is to embed it in the image with CONFIG_OF_EMBED. + + CONFIG_OF_EMBED + If this variable is defined, U-Boot will embed a device tree + binary in its image. This device tree file should be in the + board directory and called -.dts. The binary file + is then picked up in board_init_f() and made available through + the global data structure as gd->blob. - Watchdog: CONFIG_WATCHDOG diff --git a/config.mk b/config.mk index e2b440d..6e61eb6 100644 --- a/config.mk +++ b/config.mk @@ -124,6 +124,7 @@ STRIP = $(CROSS_COMPILE)strip OBJCOPY = $(CROSS_COMPILE)objcopy OBJDUMP = $(CROSS_COMPILE)objdump RANLIB = $(CROSS_COMPILE)RANLIB +DTC = dtc ######################################################################### diff --git a/dts/Makefile b/dts/Makefile new file mode 100644 index 0000000..e70a16b --- /dev/null +++ b/dts/Makefile @@ -0,0 +1,100 @@ +# +# Copyright (c) 2011 The Chromium OS Authors. +# +# See file CREDITS for list of people who contributed to this +# project. +# +# This program is free software; you can redistribute it and/or +# modify it under the terms of the GNU General Public License as +# published by the Free Software Foundatio; either version 2 of +# the License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, +# MA 02111-1307 USA +# + +# This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is +# enabled. See doc/README.fdt-control for more details. + +include $(TOPDIR)/config.mk + +LIB = $(obj)libdts.o + +$(if $(CONFIG_DEFAULT_DEVICE_TREE),,\ +$(error Please define CONFIG_DEFAULT_DEVICE_TREE in your board header file)) +DEVICE_TREE = $(subst ",,$(CONFIG_DEFAULT_DEVICE_TREE)) + +all: $(obj).depend $(LIB) + +# Use a constant name for this so we can access it from C code. +# objcopy doesn't seem to allow us to set the symbol name independently of +# the filename. +DT_BIN := $(obj)dt.dtb + +$(DT_BIN): $(TOPDIR)/board/$(BOARDDIR)/$(DEVICE_TREE).dts + $(DTC) -R 4 -p 0x1000 -O dtb -o ${DT_BIN} $< + +process_lds = \ + $(1) | sed -r -n 's/^OUTPUT_$(2)[ ("]*([^")]*).*/\1/p' + +# Run the compiler and get the link script from the linker +GET_LDS = $(CC) $(CFLAGS) $(LDFLAGS) -Wl,--verbose 2>&1 + +$(obj)dt.o: $(DT_BIN) + # We want the output format and arch. + # We also hope to win a prize for ugliest Makefile / shell interaction + # We look in the LDSCRIPT first. + # Then try the linker which should give us the answer. + # Then check it worked. + oformat=`$(call process_lds,cat $(LDSCRIPT),FORMAT)` ;\ + oarch=`$(call process_lds,cat $(LDSCRIPT),ARCH)` ;\ + \ + [ -z $${oformat} ] && \ + oformat=`$(call process_lds,$(GET_LDS),FORMAT)` ;\ + [ -z $${oarch} ] && \ + oarch=`$(call process_lds,$(GET_LDS),ARCH)` ;\ + \ + [ -z $${oformat} ] && \ + echo "Cannot read OUTPUT_FORMAT from lds file $(LDSCRIPT)" && \ + exit 1 || true ;\ + [ -z $${oarch} ] && \ + echo "Cannot read OUTPUT_ARCH from lds file $(LDSCRIPT)" && \ + exit 1 || true ;\ + \ + cd $(dir ${DT_BIN}) && \ + $(OBJCOPY) -I binary -O $${oformat} -B $${oarch} \ + $(notdir ${DT_BIN}) $@ + rm $(DT_BIN) + +OBJS-$(CONFIG_OF_EMBED) := dt.o + +COBJS := $(OBJS-y) + +OBJS := $(addprefix $(obj),$(COBJS)) + +binary: $(DT_BIN) + +$(LIB): $(OBJS) $(DTB) + $(call cmd_link_o_target, $(OBJS)) + +clean: + rm -f $(OBJS) $(LIB) + rm -f $(DT_BIN) + +distclean: clean + +######################################################################### + +# defines $(obj).depend target +include $(SRCTREE)/rules.mk + +sinclude $(obj).depend + +######################################################################### diff --git a/include/common.h b/include/common.h index bd10f31..6cdcc50 100644 --- a/include/common.h +++ b/include/common.h @@ -249,6 +249,7 @@ int checkdram (void); int last_stage_init(void); extern ulong monitor_flash_len; int mac_read_from_eeprom(void); +extern u8 _binary_dt_dtb_start[]; /* embedded device tree blob */ /* common/flash.c */ void flash_perror (int);