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env: export fdt_blob to the environment variable 

Export fdt_blob to the environment variable. So that we may
use it to boot Linux.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Thomas Chou 2015-10-16 08:44:51 +08:00 committed by Simon Glass
parent 2419cd16a1
commit 545dfd1014
2 changed files with 7 additions and 1 deletions
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3
common/board_r.c
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@ -446,6 +446,9 @@ static int initr_env(void)
env_relocate();
else
set_default_env(NULL);
#ifdef CONFIG_OF_CONTROL
setenv_addr("fdtcontroladdr", gd->fdt_blob);
#endif
/* Initialize from environment */
load_addr = getenv_ulong("loadaddr", 16, load_addr);

5
doc/README.fdt-control
View File

@ -156,7 +156,10 @@ address of the fdt binary blob, and will override either of the options.
Be aware that this environment variable is checked prior to relocation,
when only the compiled-in environment is available. Therefore it is not
possible to define this variable in the saved SPI/NAND flash
environment, for example (it will be ignored).
environment, for example (it will be ignored). After relocation, this
variable will be set to the address of the newly relocated fdt blob.
It is read-only and cannot be changed. It can optionally be used to
control the boot process of Linux with bootm/bootz commands.
To use this, put something like this in your board header file: