From what I can see the Kern310 and Kernel4 builds are for Intel CPU's, there doesn't appear to be any newer Kernels built to support AMD processors.
The last Intel Processor I used was a Pentium II although a few days ago a neighbor threw out a 1.6 GHZ Pentium 4 system which I took to grab a spare IDE HDD for a test build system.
Is there a specific document explaining Xcat usage on the Amithlon Kernel the only commands that appear to work are Xcat /proc/version and xcat/proc/fb, Xcat /proc/modules complains about an old Linux kernel being 2.4.19 and doesn't complete so I can't use pciinsmod to add modules.