From owner-freebsd-amd64@FreeBSD.ORG Sun Aug 21 16:56:20 2005 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6D37616A41F for ; Sun, 21 Aug 2005 16:56:20 +0000 (GMT) (envelope-from freebsd@deadcafe.de) Received: from deadcafe.de (deadcafe.de [81.169.162.144]) by mx1.FreeBSD.org (Postfix) with ESMTP id BDF4943D45 for ; Sun, 21 Aug 2005 16:56:19 +0000 (GMT) (envelope-from freebsd@deadcafe.de) Received: from dialin.t-online.de (p54A5F6FA.dip.t-dialin.net [84.165.246.250]) by deadcafe.de (8.13.4/8.13.4/Rock) with ESMTP id j7LGtk6g018801 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 21 Aug 2005 18:55:48 +0200 (CEST) Received: from [172.23.7.254] (doom.rock.net [172.23.7.254]) by dialin.t-online.de (8.13.4/8.13.4/Rock) with ESMTP id j7LGta9N007912; Sun, 21 Aug 2005 18:55:36 +0200 (CEST) Message-ID: <4308B208.8090003@deadcafe.de> Date: Sun, 21 Aug 2005 18:55:36 +0200 From: Daniel Rock User-Agent: Mozilla Thunderbird 1.0.6 (Windows/20050716) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: Martin Nilsson References: <20050815125657.A92343@cons.org> <20050815172250.GA32804@troutmask.apl.washington.edu> <20050815183846.A99145@cons.org> <430173BE.4080802@samsco.org> <20050816111428.A24284@cons.org> <43020F08.6070108@samsco.org> <43034B86.9080900@gneto.com> In-Reply-To: <43034B86.9080900@gneto.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.1 required=5.5 tests=FORGED_RCVD_HELO autolearn=disabled version=3.0.4 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on deadcafe.de Cc: Martin Cracauer , freebsd-amd64@freebsd.org Subject: Re: 4 GB RAM showing up as 3, BIOS memory hole and all that X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 21 Aug 2005 16:56:20 -0000 Martin Nilsson schrieb: > The E stepping Opteron can remap memory. The earlier versions can't. Also the earlier versions can remap memory, although different. If I understand the documentation correctly: http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_739_9003,00.html (Document #26094: BIOS and Kernel Developer's Guide, Section 3.5.8) on earlier models the memory can only be remapped between processor nodes, so if the first CPU has 4 GB (or more) memory attached, the memory hidden by the I/O space is lost. Daniel