diff mbox series

[U-Boot,13/45] doc: Update docs for device tree in SPL, TPL

Message ID 20181001182249.129565-14-sjg@chromium.org
State Accepted
Commit a15a7aa47be25580413a49f9e8f33ba02a46ede7
Delegated to: Simon Glass
Headers show
Series Various fixes and improvements | expand

Commit Message

Simon Glass Oct. 1, 2018, 6:22 p.m. UTC 
Make a few small updates to indicate that device tree can be used in SPL
and TPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

 doc/README.fdt-control      | 10 ++++++++++
 doc/driver-model/README.txt |  3 ++-
 2 files changed, 12 insertions(+), 1 deletion(-)

Comments

Simon Glass Oct. 9, 2018, 11:55 p.m. UTC | #1 
Make a few small updates to indicate that device tree can be used in SPL
and TPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

 doc/README.fdt-control      | 10 ++++++++++
 doc/driver-model/README.txt |  3 ++-
 2 files changed, 12 insertions(+), 1 deletion(-)

Applied to u-boot-dm
diff mbox series

Patch

diff --git a/doc/README.fdt-control b/doc/README.fdt-control
index 88c04692f74..d6ab7bf5706 100644
--- a/doc/README.fdt-control
+++ b/doc/README.fdt-control
@@ -174,6 +174,16 @@  After board configuration is done, fdt supported u-boot can be build in two ways
     $ make DEVICE_TREE=<dts-file-name>
 
 
+Relocation, SPL and TPL
+-----------------------
+
+U-Boot can be divided into three phases: TPL, SPL and U-Boot proper.
+
+The full device tree is available to U-Boot proper, but normally only a subset
+(or none at all) is available to TPL and SPL. See 'Pre-Relocation Support' and
+'SPL Support' in doc/driver-model/README.txt for more details.
+
+
 Limitations
 -----------
 
diff --git a/doc/driver-model/README.txt b/doc/driver-model/README.txt
index e949ff63bae..6085f927dea 100644
--- a/doc/driver-model/README.txt
+++ b/doc/driver-model/README.txt
@@ -832,7 +832,8 @@  Pre-Relocation Support
 For pre-relocation we simply call the driver model init function. Only
 drivers marked with DM_FLAG_PRE_RELOC or the device tree
 'u-boot,dm-pre-reloc' flag are initialised prior to relocation. This helps
-to reduce the driver model overhead.
+to reduce the driver model overhead. This flag applies to SPL and TPL as
+well, if device tree is enabled there.
 
 It is possible to limit this to specific relocation steps, by using
 the more specialized 'u-boot,dm-spl' and 'u-boot,dm-tpl' flags