After seven years of work, the LinuxBIOS project is on the brink of making a free BIOS a standard option for computers.
Look at the list of supported hardware. There seems to be a lack of any current production consumer boards on that list. It looks like the only athlon64/Opteron/turion support is for the ancient AMD-8111 reference chipset that no consumer motherboard uses.
http://linuxbios.org/Supported_Motherboards
This is worse than the trouble we have with finding supported wifi hardware.
-wolfgang