Re: selecting UBI boot partition on startup

[Wolfgang Denk <wd@denx.de>]

Dear "Deon Carr",

please jkeep the mailing list on Cc: - others might be interested in
the answers as well.

In message <0687C69BF96AF349833719247B11C1CE76ED80@exchtxus2.HSTX.global.vpn> you wrote:
> 
> >> What is the best method of selecting UBI volume to boot from in
> >> uboot?
> 
> >Store the information in U-Boot environment variables.
> 
> This was my initial thought however I was put off by the chance of the
> environment variables getting corrupted due to power loss while writing
> to U-Boot. I guess its possible to mirror the environment variables to
> another part of flash and restore it if the crc32 check fails on
> start-up.

Redundant environment is a standard feature in U-Boot. It covers
exactly the issue you have in mind - if you have a reset or power loss
while writing the environment, U-Boot will automatically fall back to
the redudant copy and use the previously used settings.

All you have to do is to enable this feature in your board config
file.

Best regards,

Wolfgang Denk

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