[U-Boot] DUTS without hardware

[Mike Frysinger]

so u-boot has DUTS for testing:
  http://www.denx.de/wiki/DUTS/

it seems to have a lot of assumptions like connecting to u-boot over
the serial port.  i'd like to extend this to support the new sandbox
target so we can do automated testing of common code without needing
any external hardware at all.

before i start digging too more, is this going to be painful to the
point of not being feasible ?
-mike