Panic on boot from CD

[Peter Grehan]

> Perhaps something is trying to do a mtx_init() or mtx_destroy() before 
> mutex_init() has been called?

  I *think* it's due to the fact that I'm not saving/restoring the 
SPRG0-3 registers when calling into OpenFirmware. It only shows up when 
you boot holding down the 'C' key, but works fine when dropping into 
OpenFirmware and manually booting. There's a similar problem on the B&W 
G3 when booting from the ATA drive.

  The panic message is related to memory corruption that occurrs - a 
mutex is getting zeroed.

later,

Peter.