[U-Boot] Switch to backup image after failure to boot

[Wolfgang Denk <wd@denx.de>]

Dear Thibault VINCENT,

In message <20090819205433.45384upebz0ijmg9@mail.tibal.info> you wrote:
> > Correct me if I'm wrong, but I thought I read in some document that you can
> > set some environment variable that will load the image from an alternate
> > location (address) after failing to boot the image at the primary location.
> > I was just wondering if someone could give me some details about this as I
> > can't remember where I read it, or if this is even possible.  Thanks.
> 
> Hello
> 
> You may try something like this :
> 
> boot2=disk 0x400000 1:6
> boot1=if disk 0x400000 0:6; then; else run boot2; fi
> myboot=ide reset; run boot1; bootm 0x400000;

Well, this will help if the image itself is corrupted. 

It will not help if for example the image is intact, so it starts to
boot but then for example hangs...


Best regards,

Wolfgang Denk

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