Can someone explain to me what the rbus code in the Cardbus driver
does?  I can't understand what it's doing nor what it is supposed to
do.  I do understand that it's broken.
I tried using a 3C562 card and that just panics the machine when
rbus is used.  The function rbus_space_alloc_subregion() fails
to allocate an I/O region but returns success anyway...
I can provide more details for the interested.

	-- Lennart