CentOS - Apr 2006 - rescue boot - udev question

Is there some documentation about what happens to populate
/dev when you boot the install disk in rescue mode and it
automatically mounts an installed system and suggests that
you chroot to /mnt/sysimage?   With Centos 3.x you could
do the mounts yourself in cases where it wouldn't work
automatically and end up looking approximately the same.
With 4.x, after the chroot, /dev appears to be empty unless
the automatic mount worked.

-- 
  Les Mikesell
   lesmikesell at gmail.com