> 
> I want to add a third disk controller to my kernel.
> 
Ok, here we take the story: I don't think that it is possible
to add more disks at all on kernels older than 1.2A. This is because
of a real ugly hack to support old config style in the uda routines.
If you put in a third disk controller, you probably don't get any
support code for it at all, and if you get I don't think it works.
Check the file mkoldconf.awk, there you can see what happens. But
it lacks code in uda.c also, I think...
The solution is to compile a kernel out of -current, it should
work now. 

-- Ragge