Date: Tue, 22 Apr 1997 18:11:11 -1000 (HST) From: "David Langford" <langfod@dihelix.com> To: msmith@atrad.adelaide.edu.au (Michael Smith) Cc: joe@via.net, mrcpu@cdsnet.net, hackers@freebsd.org Subject: Re: Can't put 512MB ram in box ... Extended memory question. Message-ID: <199704230411.SAA01625@caliban.dihelix.com> In-Reply-To: <199704230156.LAA18515@genesis.atrad.adelaide.edu.au> from Michael Smith at "Apr 23, 97 11:26:05 am"
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>> 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 [[ Is it my imagination or doesnt BSDI handle this fairly automagically? Also what are the consequences of setting MAXMEM to a high number even on low memory machine. I thought that I saw the GENERIC kernel et at 128K. -David Langfod langfod@dihelix.com
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