If you haven't seen this yet, you'll likely be impressed. RetroBSD (Unix) running on a chipKIT Fubarino SD? Yes, you heard that right :) Hackaday featured this post referencing Serge Vakulenko's post, where he provides instructions for how you too can run RetroBSD on your Fubarino SD and then compile and assemble away on your mini computer!
Have fun and enjoy!