From owner-freebsd-current Sat Mar 9 20:46:10 1996 Return-Path: owner-current Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id UAA23517 for current-outgoing; Sat, 9 Mar 1996 20:46:10 -0800 (PST) Received: from GndRsh.aac.dev.com (GndRsh.aac.dev.com [198.145.92.241]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id UAA23509 for ; Sat, 9 Mar 1996 20:46:07 -0800 (PST) Received: (from rgrimes@localhost) by GndRsh.aac.dev.com (8.6.12/8.6.12) id UAA10659; Sat, 9 Mar 1996 20:45:51 -0800 From: "Rodney W. Grimes" Message-Id: <199603100445.UAA10659@GndRsh.aac.dev.com> Subject: Re: AMD doesn't like SNAP! (panic: unwire: page not in pmap) To: jehamby@lightside.com (Jake Hamby) Date: Sat, 9 Mar 1996 20:45:51 -0800 (PST) Cc: current@FreeBSD.ORG, jkh@time.cdrom.com, toor@dyson.iquest.net In-Reply-To: from "Jake Hamby" at Mar 9, 96 07:00:15 pm X-Mailer: ELM [version 2.4 PL24] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-current@FreeBSD.ORG X-Loop: owner-current@FreeBSD.ORG Precedence: bulk > > So far three people, including myself, have reported the above panic > message when booting the 3/3 SNAP kernel. All three of us have AMD DX4 > processors (100 and 120MHz). This has got to be the problem! John, > Jordan, people working on the VM system, take note.. Thanks! Can all three of you tell me if you have A80486DX4-100NV8T's or A80486DX4-100SV8B's? The difference is the SV8B is the write back enhanced DX4 and unless you have a motherboard that understands how to deal with this you are going to have a cache coherency problem between the internal and external cache. I have yet to see a MB deal with this correctly when faced with a bus master SCSI controller, though I have seen some that work fine as long as no bus mastering is occuring. Far more don't work than do work. If you don't have SV8B's or are not running them in WB mode, then I don't have any idea what has gone wrong... -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD