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Level 15 Interrupt - Ross HyperSPARC in SS20

Posted on 2004-08-04
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Last Modified: 2013-12-27
Yes, I know this is the "Solaris" TA, but the "Hardware" TA seems to be Intel bunnies, so I guess I'll put this one here.

I have a SparcServer 20 with 512 MB RAM in which I am trying to install two (2) Ross HyperSparc MBUS CPUs. Specifics:

OBP Version: Release 2.25 Version 0 created 95/09/15 17:18:06
MBus: 50 MHz
SBus: 25 MHz
CPU#0: 200 MHz RT620/RT626 512K External Cache
CPU#2: 200 MHz RT620/RT626 512K External Cache

POST reports the CPUs as "2 X RT626".

When I attempt to "boot cdrom", I get the error "Level 15 Interrupt"

When I switch between the CPUs (e.g. using "2 switch-cpu" or "0 switch-cpu" at the "ok" prompt), I get the same error message.

I tried "ibuf-off" on both CPUs, but now when I try to boot to the CD, I get "Can't open boot device"

Any suggestions as to my next steps?
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Question by:PsiCop
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by:PsiCop
ID: 11718313
I note in passing that the Ross CPUs came from SparcStation 20 systems using OBP v2.22 and were in single-CPU configurations. Should I try backleveling the SparcServer 20 to OBP v2.22?
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by:PsiCop
ID: 11718348
And I'm attempting to boot to the Solaris v2.8 (10/00) CDs. I find a number of articles talking about problems with HyperSparcs on SS20s with SunOS and also early (2.3 and before) Solaris versions, but nothing with current versions.
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by:PsiCop
ID: 11721769
An update: Backrevved the ROM to v2.22.1H. The CPUs now report as RT-625s, but I no longer get the "Level 15 Interrupt" message.

The "boot cdrom" continued not to work, but instead of "Level 15 Interrupt" I got "Can't read disk label". I isolated this to a bad CD-ROM drive (the internal drive wouldn't work, but when I disconnected it and used an external drive, it did not have that problem).

However, what's happening now is that when I enter "boot cdrom" the machine freezes.
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by:PsiCop
ID: 11721937
OK, I think I have this solved. Apparently, the SCSI bus on the SparcServer is hosed somehow. I have a SparcStation 20 with OBP 2.22.1H and it can boot from CD using the 10/00 disk just fine, with 2x Ross RT625/626 CPUs. My conclusion is that there's something wrong with the SparcServer.

And actually, I found somewhere that said the only difference between a SparcServer 20 and a SparcStation 20 is that the "Station" shipped with a graphics board, while the "Server" did not. They're apparently otherwise the same.

Geez, about 6 hours wasted.
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