SGI Indigo 2, machtype and timers

hi!

now that I have local bits for o2 booting fine (and it runs x11 fine),
and indy is fine in trunk, I'm turning to the R4xxx series Indigo 2
machines.

There's a lot wrong, but the biggest one is that the PIT driver
(sgimips/dev/int.c) thinks its an Indy, not an Indigo2. It's doing
this because the mach_subtype for indy/indigo2 is set by
sgimips/dev/ioc.c, which attaches MUCH later than int0 does, so things
hang.

if I force the subtype to indigo2 then all is good. Well, in serial
console it's good. For graphics console it .. works, but it's very
very slow. I need to go see if that's DELAY() wrong, or something in
the grtwo driver that's not poking this GU1-Extreme card correctly.

Anyway, I'll file a bug for this soon and then see if I can commit
some direct MMIO sins in the sgimips mainbus driver to correctly
identify things early.


-adrian