LinuxBIOS has excellent support for several AMD CPUs, lately a lot of work is going into the GX2 platform since that's what OLPC is using. Earlier lots of effort was put into making Opteron based
Indeed and its just about ready to come alive and kicking. Just a few more kinks to work out. Most of which aren't really even LinuxBIOS kinks. Look for to show up on a in a test board RSN.