tree 8e34694943c898519b29c44d1df5ccc130a6c15b
parent 42758d0e06d2b02ad3fffb43c2e665289d9d986d
author Wolfgang Wegner <w.wegner@astro-kom.de> 1272036175 +0200
committer Mike Frysinger <vapier@gentoo.org> 1277956028 -0400

add redundant environment for env_sf.c

This patch adds redundant environment for environment in SPI flash.
I took env_flash.c as an example and slightly modified it. Apart
from adapting things to SF, I also slightly changed the decision
logic to use area 2 as a default in case the flags are wrong because
not having a default path worried me.

I did not add a section for CONFIG_ENV_IS_IN_SPI_FLASH in environment.h
because I did not understand if this is desired and/or needed.
So to use the feature, one has to set CONFIG_ENV_OFFSET_REDUND _and_
CONFIG_SYS_REDUNDAND_ENVIRONMENT.

I checked it by powering off my board several times during flash
erase or write, because I do not know if there are other stress
test scenarios.

Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>