[rescue] Sparc 20 Diag question

[Steve Hatle]

Yes swapping out/around memory is next on the list. I just ran out of time
last night.

The other good news from this find was a Sparc 10 that comes up with still
valid NVRAM contents! Hard drives are toast however, and the power supply fans
sound horrible...

--------- Original Message --------- Subject: Re: [rescue] Sparc 20 Diag
question
From: "Mike Spooner" <mikes at aalin.co.uk>
Date: 12/11/19 10:43 am
To: "The Rescue List" <rescue at sunhelp.org>

It's worth checking that the lowest-numbered SIMM slot is populated. SS10 and
SS20 are fussy about that. You can leave any other slot(s) empty, but not the
lowest-addressed one. Also, the traditional "Re-seating of the SIMMs" maneuver
may be wise.




 -- Mike





 On Wed, Dec 11, 2019 at 4:04 PM +0000, "Mouse" <mouse at Rodents-Montreal.ORG>
wrote:










 > Good news was when I pulled off the cover, there was a 4M VSIMM in
 > the machine :-)

 Score!

 > Bad news is that there's a failure on diags that I can't find info
 > on. It begins diag as it comes up, and then I get to:

 > MXCC Non-Cache Block Zero Test
 > CPU_00000000 >> error: target memory
 > asi 20, addr 00010004, exp 00000000, obs 00e90000

 According to the NetBSD include files, ASI decimal 20 is "flush i&d
 cache line (user)" and ASI hex 20 is "sun ref mmu bypass, ie. direct
 phys access". I suspect the latter is more likely what's going on.

 0x00010004 is just over 64k, so it's probably in the lowest-addressed
 stick of memory. I don't recall which that is, and at the moment I
 don't have a 20 I can open up to check. I daresay others here will
 have that info in their heads.

 > I'm bringing this up here since I can't seem to find any reference to
 > these tests and what they actually mean or point to. Then I may be
 > able to narrow down my troubleshooting.

 Yeah, it's annoying. I have no reference for them either; I'm just
 guessing based on what you quoted. I suspect that those diagnostics
 were never documented for customers; if so, all the info that's
 available today was either leaked or reverse-engineered.

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