just to clarify that this is OOTB (or off CD). I did a custom install and selected xen as one of the package groups that I wanted to install.
In the grub.conf options, the only choice available is ( from the file)
title Fedora Core (2.6.17-2630.fc6xen)
module /vmlinuz-2.6.17-1.2630.fc6xen ro root=LABEL=/1 rhgb
When booted into single user mode, a uname -a gives
Linux T140AV 2.6.17-1.2630.fc6xen #1 SMP
So, the kernel actually running is the SMP FC6 kernel with XEN built in. This I am assuming is the right one.
If I then continue the startup, it tries to start X to do the first boot stuff. After a while it just hangs (the whole system)
This problem could be worth a Bugzilla report as it is just using available options and nothing tailored.
Well, I seem to have fixed the problem. I edited the /etc/X11/xorg.conf and changed the driver from "nv" to "vesa" and now I can boot into X !