Re: weird daily check output
From: Bill Vermillion (bill@wjv.com)
Date: 03/28/01
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Date: Wed, 28 Mar 2001 09:39:54 -0500 From: Bill Vermillion <bill@wjv.com> To: freebsd-security@FreeBSD.ORG
> Date: Tue, 27 Mar 2001 16:34:24 -0500
> From: "Jonathan M. Slivko" <jonslivko@hotmail.com>
> Subject: Re: weird daily check output
> Actually, what I was refferring to was the portion when FreeBSD
> actually first started, and gave the copyright info, etc. It said:
> FrEeBSD, or something like that. I just thought that it was odd :P
Well 'something like that' is not quite exact enough :-).
If the first E was capitalized the second should have been also.
I've seen this one time a long time ago. I traced it through a
core dump and found there was a pattern. After bringing up
man ASCII I discovered that the ones in the wrong case were
either all odd or even, forget which, and I determined it was
the first bit in the memory that was stuck high. So could have a
bit stuck low or high.
It was on a 3MB add in memory board - that's how long ago it was -
and because of the bit position it had to a 'corner chip' in one of
any of the 32 bit blocks of chips [96 chips to make up 3MB].
And there, nestled among the 256K chips was a lonely 64K chip. All
the standard boot memory diagnostics passed it. You need to run a
memory check program that performs a walking-bit test, or
checkerboard tests, adjacent bit tests, etc.
-- Bill Vermillion - bv @ wjv . com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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