as a fellow pi user, they are great...
but id drop the peon, arch is a pain, a normal rasp weezy and you can compile cgminer from git source hapily..
also worth looking at :-
https://bitcointalk.org/index.php?topic=76502.0

which now runs happy on my pi, with spine polling
Good install doc is available at :-
http://n00blab.com/


works fine on fpga's and asics