amdtemp was patched for Brazos compatibility in Feb this year:http://www.freebsd.org/cgi/query-pr.cgi?pr=156358
And was in fact tested as working specifically on the E35M1-M Pro.
it looks like only for FreeBSD 9.
Edit: Ok some confusion from me!
It looks like a different, much larger, patch was added in Feb to support Brazos among other things. However it was applied to /head and didn't make it into the 8 tree.
The originally suggested (and tested) patch against 8.2 simply added the PCI IDs to the driver so that would be easy to apply yourself.