Not sure if this is expected or not, but I''ve been unable to boot a development guest kernel on a FC5 x86_64 host. [root@hammer ~]# xm create -c fcdev-x86_64 Using config file "/etc/xen/fcdev-x86_64". Going to boot Fedora Core (2.6.16-1.2208_FC6xenU) kernel: /vmlinuz-2.6.16-1.2208_FC6xenU initrd: /initrd-2.6.16-1.2208_FC6xenU.img Started domain fcdev-x86_64 [root@hammer ~]# -- Orion Poplawski System Administrator 303-415-9701 x222 Colorado Research Associates/NWRA FAX: 303-415-9702 3380 Mitchell Lane, Boulder CO 80301 http://www.co-ra.com