Kernel broken?

[Nathan Whitehorn]

While trying to build a new kernel to test the BMAC driver, I found that 
a kernel built from -CURRENT no longer boots on my Powermac G3.

fatal kernel trap:

    exception = 0x7 (program)
    srr0 = 0x0
    srr1 = 0x8b032
    curthread = ...
	pid = 0, comm = swapper
Stopped at 0: illegal instruction 0

It looks like it branched to a NULL pointer, but where or why is not 
clear. This happens fairly late in the boot process, after the 
Timecounters tick every 10 msec message.
-Nathan