Yaboot/OpenFirmware Error?

[Ed Sutherland <digital@twcny.rr.com>]

I'm encountering an error during dual-booting with Yaboot. After Yaboot 
reaches the Apple OpenFirmware screen and prints this:

Copying OF device tree...done
Calling quiesce...
Returning 0x1400000 from prom_init

I get this error:

DEFAULT CATCH!
code=300 at %SRR0:0140390 %SRR1:00083030

OpenFirmware locks-up and I have to manually reset the computer.

Is there a solution to this? Thanks.

Ed