Work in progress. Use at own risk.
If you want HW accelerated (via libhybris) xbmc you need, in this order:
linux-odroid-xu-hybris
libhybris-hwcomposer-odroidxu
xbmc-libhybris-frodo-{mfc|hyb} (or gotham)
and slim as desktop manager or edit /usr/bin/xbmc-standalone and change there.
(I've made separate pkkbuilds for decoding via mfc or libhybris.)
Easiest way is to go to http://forum.odroid.com/viewtopic.php?f=62&t=2898 and get the image or follow the instructions there.
gripped - forum.odroid.com