From owner-freebsd-hackers Tue Apr 22 18:56:32 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id SAA24743 for hackers-outgoing; Tue, 22 Apr 1997 18:56:32 -0700 (PDT) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id SAA24738 for ; Tue, 22 Apr 1997 18:56:29 -0700 (PDT) Received: (from msmith@localhost) by genesis.atrad.adelaide.edu.au (8.8.5/8.7.3) id LAA18515; Wed, 23 Apr 1997 11:26:05 +0930 (CST) From: Michael Smith Message-Id: <199704230156.LAA18515@genesis.atrad.adelaide.edu.au> Subject: Re: Can't put 512MB ram in box ... Extended memory question. In-Reply-To: <199704230015.RAA18198@monk.via.net> from Joe McGuckin at "Apr 22, 97 05:15:41 pm" To: joe@via.net (Joe McGuckin) Date: Wed, 23 Apr 1997 11:26:05 +0930 (CST) Cc: mrcpu@cdsnet.net, hackers@freebsd.org X-Mailer: ELM [version 2.4ME+ PL28 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Joe McGuckin stands accused of saying: > > Why the need for the MAXMEM config variable? > > Why not just probe for maximum memosry size at boot time? Because there's no standard behaviour when it comes to accessing nonexistent memory. Some systems mirror their memory, ie. with 64M on the board, addresses are all modulo-64M. Others will spontaneously reboot if you try to access an address with no memory behind them. > Joe > -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[