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From: michael butler <imb@scgt.oz.au>
Message-Id: <199602271505.CAA00676@asstdc.scgt.oz.au>
Subject: Re: Opti 82C895 cache coherency ?
To: terry@lambert.org (Terry Lambert)
Date: Wed, 28 Feb 1996 02:05:55 +1100 (EST)
Cc: current@FreeBSD.ORG
In-Reply-To: <199602262055.NAA02567@phaeton.artisoft.com> from "Terry Lambert" at Feb 26, 96 01:55:57 pm
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Terry Lambert writes:

> > I wonder if anyone can vouch for an Opti 82C895/82C602 motherboard with
> > an AMD 486DX4/100 in respect of cache coherency. Specifically, in
> > combination with an Adaptec 2842 (VLB) controller. Just trying to track
> > down a "quirk" with a (sort of working) -stable .. I don't know if it's
> > -stable or the motherboard :-(
 
> Does it work with cache disabled?

Nope.
 
> If so, I suspect the VLB slot the controller is in is not a master slot.

Fortunately, there are three documented (!) in the manual but, of course, I
only want one. If I use "master slot 1" it won't boot. If I use either slot
labelled "master slot 0", it will but then it won't talk to the ethernet
card (WD8013EPC, 0x280, 5, 0xd8000) :-( It simply hangs in (NFS) mounting
some shared directories.

If, however, I replace the 2842 with a Buslogic 542B (ISA) and reboot with
an older version of -stable, it will fly quite happily even if strangled on
disk I/O. I am assuming that a cache problem would exhibit some symptoms
with this card as well.

I'm just about to build a "new" version of -stable with the aha driver in it
to see if it exhibits the same symptoms ..

	michael