oh you're gonna love this......

[Mike O'Dell]

sick, twisted, and magnificent

http://retrobsd.org/

"RetroBSD is a port of 2.11BSD Unix intended for embedded systems with
fixed memory mapping.The current target is Microchip PIC32 
microcontroller with 128 kbytes of RAM and 512 kbytes of Flash. 
PIC32 processor has MIPS M4K architecture, executable data memory and 
flexible RAM partitioning between user and kernel modes."