The linux.0 pxe bootstrap for booting linux from a pxe server is inoperative as delivered on the 6.1 RPM and SRPM CDs. Using misc/src/trees/boot/vmlinuz for linux.1 and misc/src/trees/initrd-network.img for linux.2. It hangs in prepare.c of the pxe/linux-nmp code.
Todd, you haven't mentioned this again so I'm assuming this was a problem on that hardware?