http://ftp.scientificlinux.org/linux/scientific/5rolling/x86_64/SL/kvm-83-105.el5_4.1.x86_64.rpm
requires etherboot-zroms-kvm but I can't find the etherboot packages.

RedHat added etherboot in
http://rhn.redhat.com/errata/RHEA-2009-1276.html

Thanks,

-- 
Dr. Andrew C. Aitchison		Computer Officer, DPMMS, Cambridge
[log in to unmask]	http://www.dpmms.cam.ac.uk/~werdna