Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!ames!pasteur!walnut!hastings
From: hastings@walnut (Mark Hastings)
Newsgroups: comp.unix.ultrix
Subject: Re: Loss of memory
Summary: Hardware problem
Message-ID: <16926@pasteur.Berkeley.EDU>
Date: 7 Sep 89 18:57:34 GMT
References: <16787@pasteur.Berkeley.EDU>
Sender: news@pasteur.Berkeley.EDU
Reply-To: hastings@sequoia.Berkeley.EDU (Mark Hastings)
Organization: University of California at Berkeley
Lines: 16

In article <16787@pasteur.Berkeley.EDU> I wrote:
>I am having a problem with Ultrix 3.1 on some new DecStation 3100s.
>These machines have 24MB of RAM, and the hardware tests seem to find
>and test all of it.  But when vmunix starts up, it can only "see" 16MB
>of it.  The generic kernel also fails to see this memory.

It turns out that we had a hardware problem with some of the SIMMs.
I could have determined this right away if I had just known about the
"t ?" command from the console monitor.  Try it.  It is much different
from the "test" command -- much more in-depth and informative.

Unfortunately, the power-on memory diagnostics are not as rigorous,
since they didn't catch the problem.  I hope this saves other people
from banging their heads needlessly.

--Mark