Clean up the name space here a bit.
Add a `busname' element to struct ofprobe (now struct ofbus_attach_args), and
check against it.
Nuke `ofroot'.
Rename the `openfirm' attribute to `ofbus'.
- If the partition is already open, skip the open/close step. (Sync
with other disk drivers.)
- foosize()'s return value is in DEV_BSIZE units; adjust the size obtained
from the disklabel accordingly.
- Pass correct arguments to ofdopen() and ofdclose().
- Determine and remember if we are a floppy.
- Workaround for what is apparently a firmware bug - ignore the sector
size returned by the device. On my Firepower's floppy, block-size
is the same as max-transfer, which causes Lossage.
- Don't read the disklabel on a floppy; do what the ISA floppy driver
does, which is assign the entire disk to each "partition", although
we do not deal with the density stuff.
- FIREPOWERBUGS -> FIRMWORKSBUGS
- Some general cleanup.
