[U-Boot] Can I have a backup boot option ?

[Mark Jackson]

Our current system works fine (booting from flash or nfs), but I'd also like to add a "recovery" feature.

If an end-user inserts an MMC card containing some "magic marker" files, the target will detect these and boot from the MMC card instead of using the standard boot option.

For portability, I guess I could use the Hush option and construct some big if..else..fi statement to check for the MMC card files and boot accordingly. Is this a simple-ish task ?

An easier, but less portable, way would be to hard-code the checks in the startup code before the standard boot process.

I've done a quick check of the README and the source code, but nothing else seems to stand out as a possible solution.

Anyone got any ideas ?

Thanks
Mark