I seem to have my foot stuck in a gopher hole. I'm confused about a few things.
- the hp.c driver in boot/ ignores the partition argument (making it impossible
to boot a miniroot I think). fortunately the other drivers in boot/ (ra & mfm)
do honor the partition arg.
- if one does get a miniroot kernel to boot, the partition info is not
communicated to the new kernel. so it thinks you booted from partition 0
('a') and uses that as root. rather confusing.
am I correct about that?
4.3bsd sends the boot partition in r10. It seems like using one of the
"rpb" registers (like r4) might be a better plan. Is there any reason
not to send the boot partition info in r4? (i.e. rpb_bootr4)
other platforms (1-2 anyway) seem to use MAKEBOOTDEV()