Just for the record, I was able to run Freenas 0.64 on
both the Soekris net4501 and 4801-60. I used various
controllers, including Promise 150 and Belkin 150. The
Adaptec ASH crashed both platforms. I used a number of
drives including WDC, Seagate and Maxtor. All drives
and controllers were S/ATA.
The 4501 was unable to sustain file transfers for any
significant length of time before panicing and crashing.
The 4801 with 256M of ram was able to give a consistent
throughput of 2Mbytes/sec. Very slow.
I've stopped testing these units, and might move on to
a mini-itx platform.