Howto create /dev/sr0 for devfs

[Mark <mdevin@ozemail.com.au>]

I have a HP 8200 usb CD Writer Plus and am trying to get it to work.

I have compiled the necessary modules for a 2.4.3 kernel.  When I load
the usb-ohci module, it finds the HP 8200 but I can't seem to access it.

I think the problem is with devfs.  If I try and mount it I get the
following:
# mount /usbcdrw
mount: special device /dev/scd0 does not exist
And it is right.  It doesn't exist!  See here:
$ ls -al /dev/scd0
lr-xr-xr-x    1 root     root            3 Apr 22 16:21 /dev/scd0 -> sr0

$ ls -al /dev/sr0
ls: /dev/sr0: No such file or directory

So, how do I create the device /dev/sr0 under devfs?  Or should it be
called something else in devfs since it is a usb device?

Thanks.

Mark.