this is what brucee said a while back about an ARM Cortex-M3
based device:

> I found the data sheet for the
> Cortex chip if someone needs it. A bit of a challenge for an arm port
> but it's fun indeed.

the "fun" refers to this device:

http://www.stm32circle.com

> In the recent NeXT thread Eric mentioned the TI Beagle Board
> (http://beagleboard.org/). It's quite neat: $150 for a 3" x 3" PCB
> w/ a 600 MHz ARM core, HD capable video, and SD card, audio, serial,
> USB and DVI ports. The documentation seems fairly complete, although
> according the mailing list there are issues about how much of the
> video and DSP interfaces will be documented. Hardware-wise it seems
> it only needs Ethernet to make it capable of being a Plan 9 terminal,
> although in theory that can be added via USB.
>
> How much would be involved in porting Plan 9 to it? Would the current
> Plan 9 ARM compiler be up to the task?
>
> John