[SunHELP] sparc10 fails POST. what is wrong?

[bran tregare]

At 03:50 PM 2/16/02 -0700, you wrote:
>  my sparc10 went quiet a bit ago, and i am trying to diagnose what is
>wrong.
> >    <<< CPU_00000000 on MBus Slot_00000000 >>>
> >     ERROR : Address = 00000000,
> >     exp[31:00] = aaaaaaaa, obs[31:00] = aaaaaa8a, xor[31:00] = 
> 00000020Can't map device /eccmemctl at f,0

Um, have you tried another CPU in that beastie?  that looks like a failure 
in the CPU module, possibly in the onboard cache?