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ARM: rpi_b: load /uEnv.txt from MMC at startup

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The Pi has no flash to store an environment in the usual fashion. However,
the user may wish to customize the environment. We know that the SD card
must be present, since that's where the boot ROM has loaded U-Boot from.
So, load uEnv.txt from there early during boot. This allows the user to
e.g. customize boot_targets, in order to automatically select network
boot.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stephen Warren 2014-02-05 20:49:22 -07:00 • committed by Albert ARIBAUD
parent 29235b7337
commit 5c92d4823d
1 changed files with 5 additions and 0 deletions
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5
include/configs/rpi_b.h
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@ -95,6 +95,11 @@
#define CONFIG_SYS_LOAD_ADDR 0x1000000
#define CONFIG_CONSOLE_MUX
#define CONFIG_SYS_CONSOLE_IS_IN_ENV
#define CONFIG_PREBOOT \
"if load mmc 0:1 ${loadaddr} /uEnv.txt; then " \
"env import -t ${loadaddr} ${filesize}; " \
"fi"
/*
* Memory layout for where various images get loaded by boot scripts:
*