I it is udev, as there is a message at boot up that devfs is not supported but that kernel.
Though I have just been through both messages and dmesg but cannot find reference to either devfs or udev. Though I did find udev in /etc, /etc/init.d and /sbin, with devfs only in /etc.
I'm just going through the udev-FAQ now, but since I have left the camera at home, I won't be able to test anything intil the weekend...