- Use aprint_*() rather than printf().
- Split device_t from iobus_softc and remove the latter since it's empty.
- Use device_t and cfdata_t rather than explicit structure pointers.
This is more flexible than the old acorn26 bus_space, which means that single
read/write operations are slower, but multi and region operations have the
potential to be faster, and particularly insane podules might be supportable.
In theory the acorn32 mainbus and podulebus code ought to be shareable, but
acorn26 needs the extra overhead of saving R14_svc on some operations so
I've made my own version for now. Also the acorn32 bus_spaces are a mess.
matching names. This commit might include some private hacks that have been
lurking in my tree a while. They're all harmless, and this reduces the number
of gratuitous diffs I have to deal with.
