space address and use it where the mappings of the VGA card are registered
before descenting too deep into "memory" type specific code
(pci_mem_find() gets noisy if it doesn't like the register)
is mapped in a way that is inaccessible by a 32-bit bus_addr_t, then
print a message to that effect and return failure.
Original patches by Bill Studenmund, with a few small changes by me.
pci_map_mem(), with appropriate changes for bus_space.
* Add extra arguments for use by pci_mapreg_*(), and make the functions
static.
* Rewrite pci_mapreg_info() and pci_mapreg_map() as wrappers around
pci_*_find(), using the documented interface.
drochner