Originally Posted by M$ISBS
What is udev support?
udev is a replacement for devfs (which you have used with 2.4 kernel and which is no longer maintained). It is responsible for creating device links in /dev and sending udev events to the kernel's hotplug system so that the right kernel modules can be loaded for your hardware.
So to use kernel 2.6.x you need udev. The old hotplug system (a seperate package, is not the same as the kernel's hotplug system) and devfs are not used anymore.
Hit me if that is wrong in some part, but this is how I understand what udev is doing