I have installed xen (from the coverdisk) under Fedora Core 4.
When I try to boot xen, everything appears normal until I get the following error:
Root-NFS: no NFS Server available, giving up
VFS: Unable to mount root fs via NFS, trying floppy
VFS: Insert root floppy and press ENTER.
I don't have or know what a root floppy is.
When I press ENTER, the system reboots.