The ROM images on /usr/share/qemu-kvm/rhel6-*.rom come from the Red Hat Enterprise Linux 6.4 package gpxe-roms-qemu-0.9.7-6.9.el6.noarch.rpm. The source code for those images can be downloaded from: http://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/gpxe-0.9.7-6.9.el6.src.rpm For more information on how to obtain source code for Red Hat Enterprise Linux software, you can refer to Chapter 1. Obtaining Red Hat Enterprise Linux of the Red Hat Enterprise Linux Installation Guide.