[rescue] SS10 CPU detection problems

[Alexander Bochmann]

Hi, 

I own a SparcStation 10 with two 390Z55 (501-2352 SM51) CPU boards. 
It used to happily come up with both, but recently it sometimes 
drops into firmware with a Watchdog Reset, and reports only 
1 X 390Z55.

I've tried to find out which of the boards is bad, but it gets even 
more strange from there - the system won't do anything at all with 
only one of the MBUS slots populated (I get one keyboard blink, but 
the system LED stays off, regardless of which CPU I use). Same when 
I swap both boards around.

Has anyone run into something like this? I don't really have any 
debugging tools other than what's provided by the system. It 
currently has Solaris 2.5.1 installed, which does boot despite 
all this weirdness, provided there's no Watchdog Reset first.

Alex.