Date: Fri, 25 Apr 1997 05:18:34 -0500 (CDT) From: Wayne Baety <mrfoine@enteract.com> To: David Langford <langfod@dihelix.com> Cc: Michael Smith <msmith@atrad.adelaide.edu.au>, joe@via.net, mrcpu@cdsnet.net, hackers@freebsd.org Subject: Re: Can't put 512MB ram in box ... Extended memory question. Message-ID: <Pine.BSI.3.95.970425051734.10180F-100000@enteract.com> In-Reply-To: <199704230411.SAA01625@caliban.dihelix.com>
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On Tue, 22 Apr 1997, David Langford wrote: > >> Why the need for the MAXMEM config variable? Why not two MAXMEM variables... MAXMEMLO MAXMEMHIGH or something the like > >> > >> 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.
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