Apparently I live in the dark ages. It looks like people do tftp over usb on embedded devices quite often.
http://osdir.com/ml/linux.distributi.../msg00023.html
http://comments.gmane.org/gmane.linu....embedded/2436
Quote:
> How about the TFTP over USB? It's required feature for no ethernet devices
you'll have to be more specific if you want a real answer. U-Boot has
USB Ethernet gadget support already.
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More reading....
Well, the other alternative is seeing if u-boot can see a USB flash as some kind of memory range. Then you could copy X bytes from USB flash to a memory address and boot it.