load driver modules from inside a %pre script

Hi,

I have a requirement for a custom RHEL5.4 system that installs from a DVD,
but only if a licence file is present on a USB stick. I've built the
system as a custom kickstart DVD, and all is fine if the user installs in
just the right way, but I have 2 problems:

	1. On some systems (e.g. cciss), the drive appears as sda, on others it
gets bumped to sdb because the main disk is sda. Is there some trick to
finding the device name for a usb stick?

	2. If the user doesn't have to USB drive inserted initially, I have to
present a warning and ask them to insert it ­ but by this time, there is
no usb_storage driver so it doesn't appear as a drive. Modprobe does
nothing.

Any help with either of these would be much appreciated, but especially
problem 2. I don't know how the anaconda system is loading the modules.

Paul.