> Is there any documentation on the basic steps needed to add new driver
> code to the kernel (i.e....how driver code is called during the kernel
> initialization...how to add the code to the config files...things like
> that).

The page at http://www.netbsd.org/Documentation/kernel/programming.html has
links to "Adding a new driver to the Kernel" and porting info for old BSD
and FreeBSD network drivers.  Also,
http://www.netbsd.org/Documentation/kernel/pseudo/ talks about how to add a
pseudo device which may help.

Good luck!

Mike.