| Log Message:
| Pull in geocast mips ddb improvements and start bringing in kgdb support.
| Add ddb support for QED opcodes, fill in enough routines so "next" usually
| works, kdbpoke support for any size.

OK.

| Add callback that ports can hook when entering and leaving ddb.
| This can be used for things like turning off watchdogs while in ddb.

This should be MI, in db_trap(), unless there's a good reason otherwise.

Could you back the callbacks?

--jhawk