From owner-freebsd-questions@FreeBSD.ORG Thu Jun 16 22:11:23 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 31911106566B for ; Thu, 16 Jun 2011 22:11:23 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from mail-out.apple.com (bramley.apple.com [17.151.62.49]) by mx1.freebsd.org (Postfix) with ESMTP id 16F1D8FC0A for ; Thu, 16 Jun 2011 22:11:22 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII Received: from relay12.apple.com ([17.128.113.53]) by mail-out.apple.com (Oracle Communications Messaging Exchange Server 7u4-20.01 64bit (built Nov 21 2010)) with ESMTPS id <0LMW00CJRLL28LY0@mail-out.apple.com> for freebsd-questions@freebsd.org; Thu, 16 Jun 2011 15:11:22 -0700 (PDT) X-AuditID: 11807135-b7b76ae000001169-a7-4dfa7fdf76a1 Received: from cswiger1.apple.com (cswiger1.apple.com [17.209.4.71]) (using TLS with cipher AES128-SHA (AES128-SHA/128 bits)) (Client did not present a certificate) by relay12.apple.com (Apple SCV relay) with SMTP id B8.78.04457.FDF7AFD4; Thu, 16 Jun 2011 15:12:47 -0700 (PDT) From: Chuck Swiger In-reply-to: <20110616141030.0f3dc5f3@dell64> Date: Thu, 16 Jun 2011 15:11:22 -0700 Message-id: <110DEE0E-92A6-4202-B072-0EC5104B839E@mac.com> References: <20110616141030.0f3dc5f3@dell64> To: Robert X-Mailer: Apple Mail (2.1084) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrMLMWRmVeSWpSXmKPExsUieJHFXfd+/S9fg68rNSxeft3EYjHhyWN2 ByaPgxMOMnrM+DSfJYApissmJTUnsyy1SN8ugStjxtu/bAVPWCt+tv9ka2DczdLFyMkhIWAi cevhJSYIW0ziwr31bF2MXBxCArOYJFY+WAxWJCxgJLF2xw9WEJtXwFBi6aZ2dhCbWUBL4sa/ l2DNbAIqEotn/WcGsTkFdCXWTLwKVs8ioCrRvOUGI0S9s8SXf+9YIWx5ie1v5zBDzLSS+H1y G9gcIQEdiU2dbWDzRQQUJCbufQ0U5wA6TlaiaVnGBEb+WUiumIXkillIpi5gZF7FKFiUmpNY aWikl1hQkJOql5yfu4kRFHQNhaY7GB8tVD/EKMDBqMTD62j9y1eINbGsuDL3EKMEB7OSCO+p 3z99hXhTEiurUovy44tKc1KLDzFKc7AoifO+ve/pKySQnliSmp2aWpBaBJNl4uCUamAM2LLI /wKv1+yQT31qeut1Hoexxk1ePaWjWoapzydlvsZCf4tlDmv/152Stz3P6qXkyMpsnhrTyPlE pXri2yk8v9bMvLuPebLelNied5eLQve6MYv/TebJSNvo8dxWySLm1yyddapsMR3Xr55VC2r8 PsexNSjnRN2ZhbrL17P9TmB16pMPWK/EUpyRaKjFXFScCACvHrCONgIAAA== Cc: "freebsd-questions@freebsd.org" Subject: Re: OT: Strange memory reading (hardware) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Jun 2011 22:11:23 -0000 On Jun 16, 2011, at 2:10 PM, Robert wrote: > I have tested with all of the sticks installed and with one at a time. > When all of the sticks are installed, BIOS show a total of 2752 MB of > RAM. If any of the sticks are installed alone in any of the four slots, > BIOS then shows 960 MB instead of the 1024 one would expect. Sounds like the BIOS is stealing 64MB for video RAM. There's likely a BIOS setting which governs the size of this. As for not being able to access all 4GB, this is a FAQ. If you run a 32-bit system, the top gigabyte or so of address space is reserved for memory mapped I/O reservations like AGP, PCIe, etc. If your hardware is capable of running in 64-bit mode, do that. Regards, -- -Chuck