I've just downloaded the 2.4.20-2mdk kernel source package from Cooker.
The dabusb drivers are badly out of date. The applications currently
available (from http://www1.baycom.de/download/dabusb/) to use these
drivers won't work with this version. The kernel and source packages
need to be updated with the driver package at the above location. Might
be a nice idea to package up the applications too, although they come
precompiled, and I couldn't find anything about their license terms (the
drivers are GPL).
Cheers,
Bruno Prior