I replaced devfs with udev.
I am surprised debian lenny offers the option of devfs
which is, I think, deprecated now.
Sometimes I'm a "Just force
it to work" sort of person. So I'd just put
at the end of the file /etc/rc.local
just before the final exit(0)
Other people will probably offer more elegant solutions.
If you'd like to research a more elegant solution, you could start by reading up on hotplug
And "Welcome to LQ!"