I'm using a GA-E350N-USB3 (rev. 1.0)
www.gigabyte.us/products/product-page.aspx?pid=3681It's pretty bland, shouldn't be anything too exotic on this board. m0n0wall gets to the point right after it finds the kernel and then it panics.
Just for funzies, I tried booting FreeBSD 9.1 amd64 on it, which works more or less fine. I'm not sure where the hold-up is.
I've tried setting the bios to fail-safe defaults, i've tried switching some options to suit unix better, same results.
Linux distros i've tried work fine....actually, pretty much any OS that isn't m0n0wall works pretty well.
In one test, I wrote the m0n0wall image to a usb stick, and booted my mac mini with it - which worked perfectly.
I used that same stick to try and boot the amd E350 and it panics as described above.