I've tried mining on a Pi and on my Atom laptop (Ubuntu). It mines but performance seems low. cgminer looks like this:
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(5s):196.0M (avg):2.273Gh/s | A:416 R:32 HW:0 WU:33.4/m
ST: 2 SS: 0 NB: 3 LW: 745 GF: 0 RF: 0
Connected to mmpool.bitparking.com diff 16 with stratum as user blah
Block: 001bde38c9d8e8f1... Diff:86.9M Started: [19:34:32] Best share: 507
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[P]ool management [S]ettings [D]isplay options [Q]uit
BTB 0: 44C 282 1225mV | 2.445G/2.273Gh/s | A:416 R:32 HW:0 WU: 33.4/m
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[2013-09-10 19:35:03] Rejected 07c6e3be Diff 32/16 BTB 0
[2013-09-10 19:35:55] Accepted 037c9b80 Diff 73/16 BTB 0
[2013-09-10 19:36:11] Accepted 050a295f Diff 50/16 BTB 0
[2013-09-10 19:36:58] Accepted 043e8c3c Diff 60/16 BTB 0
[2013-09-10 19:37:21] Accepted 0977444c Diff 27/16 BTB 0
[2013-09-10 19:38:28] Accepted 06ec884b Diff 36/16 BTB 0
[2013-09-10 19:38:39] Accepted 060fdfff Diff 42/16 BTB 0
[2013-09-10 19:38:56] Accepted 00813d5b Diff 507/16 BTB 0
[2013-09-10 19:39:28] Accepted 05422507 Diff 48/16 BTB 0
[2013-09-10 19:39:33] Accepted 0ba7c080 Diff 21/16 BTB 0
Any ideas what I should look at?