cdrom cannot be found in xen0

[Eric Benton]

 I'd compiled the sources of xen3 unstable and booted successfuly into 
xen0, where xend is working and everything is ok.

The only problem is, I can't find my cdrom under /dev. I'm running FC5 
and when not at xen0, my cdrom is at /dev/hdc

Is it something related to udev? or the initrd?

Thanks in advance,
Eric.