[rescue] SPARCstation 1 boot woes

[Ethan Hawke]

> Upon further consideration of the symptom, a power supply issue also
> seems unlikely because the boot firmware recovers cleanly from the
> malfunction and returns to the "ok" prompt. I would expect a power-
> related malfunction to send it off into executing nonsense and crashing
> or just resetting the system.
>
> Any other ideas?
OpenBoot has a very powerful debugger built-in, you can use that to try 
and find
the faulting instruction, after the trap is raised use '%pc dis' to 
disassemble the
bootloader, it will print the faulting instruction and the memory 
address it was
running at, if it's an illegal instruction it will likely read 'unimp', 
but you can then
cross-reference the address with boot.net program to determine if it's 
actually an
unimplemented instruction or something else such as memory corruption.

You can also use '%pc 100 dump' to view the memory directly.

Good luck,
Ethan