I know this is a topic a lot of people are interested in. How
to get udev hotplugging working. It's not a simple procedure,
but I got it to work on a Sparc so it should work for everyone.

You will need the 2.6.16 kernel.

Second, you will need to use udev 088 or above, here is the build instructions
you must use to get full functionality.
make EXTRAS="extras/firmware extras/floppy extras/cdrom_id extras/scsi_id extras/volume_id extras/ata_id extras/usb_id extras/edd_id extras/dasd_id" udevdir=/dev

make EXTRAS="extras/firmware extras/floppy extras/cdrom_id extras/scsi_id extras/volume_id extras/ata_id extras/usb_id extras/edd_id extras/dasd_id" udevdir=/dev install
cp extras/path_id /sbin
cp extras/eventrecorder.sh /lib/udev
rm -rf /etc/udev/rules.d/*

Third you will need the udev package that the Cross-LFS team developed.
I keep tarballs available on my system for download

http://ftp.jg555.com/udev/udev-cross-lfs.tar.bz2

To install this package use make install

Then make sure you remove your hotplug script if you have it running in /etc/rc.d/