From owner-svn-doc-head@FreeBSD.ORG Mon Oct 29 04:28:29 2012 Return-Path: Delivered-To: svn-doc-head@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id F1C4D23E; Mon, 29 Oct 2012 04:28:28 +0000 (UTC) (envelope-from eadler@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id C00678FC15; Mon, 29 Oct 2012 04:28:28 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q9T4SSFh076408; Mon, 29 Oct 2012 04:28:28 GMT (envelope-from eadler@svn.freebsd.org) Received: (from eadler@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id q9T4SS6I076406; Mon, 29 Oct 2012 04:28:28 GMT (envelope-from eadler@svn.freebsd.org) Message-Id: <201210290428.q9T4SS6I076406@svn.freebsd.org> From: Eitan Adler Date: Mon, 29 Oct 2012 04:28:28 +0000 (UTC) To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r39834 - head/en_US.ISO8859-1/books/faq X-SVN-Group: doc-head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-doc-head@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: SVN commit messages for the doc tree for head List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Oct 2012 04:28:29 -0000 Author: eadler Date: Mon Oct 29 04:28:28 2012 New Revision: 39834 URL: http://svn.freebsd.org/changeset/doc/39834 Log: BIOS detecting an absurdly low amount of memory is no longer a concern. Approved by: bcr (mentor) Modified: head/en_US.ISO8859-1/books/faq/book.xml Modified: head/en_US.ISO8859-1/books/faq/book.xml ============================================================================== --- head/en_US.ISO8859-1/books/faq/book.xml Mon Oct 29 01:15:07 2012 (r39833) +++ head/en_US.ISO8859-1/books/faq/book.xml Mon Oct 29 04:28:28 2012 (r39834) @@ -3141,36 +3141,6 @@ quit - - Why does &os; only use 64 MB of RAM when my system - has 128 MB of RAM installed? - - - - Due to the manner in which &os; gets the memory size - from the BIOS, it can only detect 16 bits worth of - Kbytes in size (65535 Kbytes = 64 MB) (or less... - some BIOSes peg the memory size to 16 MB). If you have - more than 64 MB, &os; will attempt to detect it; - however, the attempt may fail. - - To work around this problem, you need to use the kernel - option specified below. There is a way to get complete - memory information from the BIOS, but we do not have room in - the bootblocks to do it. Someday when lack of room in the - bootblocks is fixed, we will use the extended BIOS functions - to get the full memory information... but for now we are - stuck with the kernel option. - - options MAXMEM=n - - Where n is your memory in - Kilobytes. For a 128 MB machine, you would want to use - 131072. - - - - My system has more than 1 GB of RAM, and I'm getting panics with kmem_map too small