problem building barebox for the beagle xM

for anyone interested in playing with barebox instead of u-boot on
their xM, it used to build bootable images, but recently there's some
breakage. just for posterity, after some debugging and git bisecting,
i wrote it up here:

  http://www.crashcourse.ca/wiki/index.php/Barebox_on_the_xM

but haven't yet investigated further. feel free to poke around.

rday