Hmmmmmm... I understand that Steve Bennett got uClinux to run XIP from ***SERIAL*** flash on a WildFire SBC. This was back a while on 2.6.19. Perhaps it has broken since?
Depending on the hardware the processor does not even need to know that the thing in it's address space uses a serial interface. But this will likely be rather be rather slow (if not using an Athlon hyper transport channel :) ). OTOH a CPU cache can relax the speed problem greatly.

-Michael
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