[U-Boot] [PATCH 2/4] env_nand.c: support falling back to redundant env when writing

[Scott Wood]

On 11/21/2012 06:59:19 AM, Phil Sutter wrote:
> Without this patch, when the currently chosen environment to be  
> written
> has bad blocks, saveenv fails completely. Instead, when there is
> redundant environment fall back to the other copy. Environment reading
> needs no adjustment, as the fallback logic for incomplete writes  
> applies
> to this case as well.
> 
> Signed-off-by: Phil Sutter <phil.sutter at viprinet.com>

Isn't this what CONFIG_ENV_RANGE is supposed to deal with?

Redundant environment is to deal with other problems such as a power  
failure during saveenv.  If you just fall back to the other copy,  
you're silently losing the redundancy.

-Scott