From owner-freebsd-current@FreeBSD.ORG Thu Jan 22 19:37:57 2009 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1B0A1106566B for ; Thu, 22 Jan 2009 19:37:57 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from mail-out3.apple.com (mail-out3.apple.com [17.254.13.22]) by mx1.freebsd.org (Postfix) with ESMTP id 011158FC14 for ; Thu, 22 Jan 2009 19:37:56 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from relay11.apple.com (relay11.apple.com [17.128.113.48]) by mail-out3.apple.com (Postfix) with ESMTP id 25DB24DA0064; Thu, 22 Jan 2009 11:21:47 -0800 (PST) Received: from relay11.apple.com (unknown [127.0.0.1]) by relay11.apple.com (Symantec Brightmail Gateway) with ESMTP id 0E4F045C0001; Thu, 22 Jan 2009 11:21:47 -0800 (PST) X-AuditID: 11807130-ab096bb000000fcd-87-4978c74a3ca3 Received: from cswiger1.apple.com (cswiger1.apple.com [17.227.140.124]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by relay11.apple.com (Apple SCV relay) with ESMTP id E71202807E; Thu, 22 Jan 2009 11:21:46 -0800 (PST) Message-Id: From: Chuck Swiger To: hartzell@alerce.com In-Reply-To: <18808.49120.167837.490082@almost.alerce.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v930.3) Date: Thu, 22 Jan 2009 11:21:46 -0800 References: <18808.49120.167837.490082@almost.alerce.com> X-Mailer: Apple Mail (2.930.3) X-Brightmail-Tracker: AAAAAA== Cc: freebsd-current@freebsd.org Subject: Re: Steps to debug memory/motherboard (Via VB8001) problem X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Jan 2009 19:37:57 -0000 On Jan 22, 2009, at 10:50 AM, George Hartzell wrote: > I can run with either of the DIMMs in the first slot and am able to > build and install world and kernel. > > If I populate both slots then I can run for a bit (e.g. make > buildkernel) before I end up in the debugger or with the build bombing > out with a message about "bad address". Sounds like the motherboard or the memory is marginal, and the combination of the 2 DIMMs puts it out of spec. Try running memtest86 overnight and see whether that finds errors. If so, you might be able to reduce the RAM timings in the BIOS and get it stable, or you might not. Are the two DIMMs identical (ie, same vendor, same specs)? -- -Chuck