[oe] RFC; Building multiple u-boot images for a single board

[Marcin Juszkiewicz]

+1 on it as it really saves times. 

I have at91sam9263ek board which can boot (read: load u-boot) from dataflash 
or from nand (if you have newer revision of board then I) so two uboots needs 
to be built for it.

Regards, 
-- 
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