From owner-freebsd-hardware  Mon Oct 13 17:17:40 1997
Return-Path: <owner-freebsd-hardware>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id RAA05080
          for hardware-outgoing; Mon, 13 Oct 1997 17:17:40 -0700 (PDT)
          (envelope-from owner-freebsd-hardware)
Received: from implode.root.com (implode.root.com [198.145.90.17])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id RAA05075
          for <hardware@FreeBSD.ORG>; Mon, 13 Oct 1997 17:17:37 -0700 (PDT)
          (envelope-from root@implode.root.com)
Received: from implode.root.com (localhost [127.0.0.1])
	by implode.root.com (8.8.5/8.8.5) with ESMTP id RAA20337;
	Mon, 13 Oct 1997 17:18:36 -0700 (PDT)
Message-Id: <199710140018.RAA20337@implode.root.com>
To: Bruce Albrecht <bruce.albrecht@seag.fingerhut.com>
cc: hardware@FreeBSD.ORG
Subject: Re: Parity/ECC memory 
In-reply-to: Your message of "Mon, 13 Oct 1997 17:40:33 CDT."
             <9710132240.AA02103@g0024.seag.fingerhut.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Mon, 13 Oct 1997 17:18:36 -0700
Sender: owner-freebsd-hardware@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

>I have a Pentium Pro system with the Intel 440FX chipset.  If I have 2
>32M x 36 SIMMs, can I set the chipset to ECC

   Yes. That's how it works - the 8 parity bits are used to construct the
ECC syndrome.

>check parity?  What type of memory do I have to order if I want to set
>it to ECC?  I'm having problems with my system claiming there are
>memory problems when I turn on ECC (and maybe when I turn on parity
>checking as well), and my vendor is claiming that my memory is only
>good for straight parity checking.  I've looked at the Intel
>datasheets, and the only requirements they mention for ECC is x72
>memory and a BIOS which supports it (which I have).

   Check to make certain that the SIMMs are true parity and not "simulated"
parity.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project