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Date: Thu, 14 Sep 2006 13:54:09 -0400
From: Martin Cracauer <cracauer@cons.org>
To: RJ45 <rj45@slacknet.com>
Message-ID: <20060914175409.GB16873@cons.org>
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Cc: freebsd-questions@freebsd.org
Subject: Re: memory problem
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RJ45 wrote on Thu, Sep 14, 2006 at 02:24:43AM -0600: 
> 
> 
> Hello,
> I am running FreeBSD 6.1-RELEASE-p6 build with buildworld.
> 
> THe system has exactly 4GB of memory but the memory is not complitely
> seen by the system.
> 
> At boot thime I Get this warning
> 
> 524288Kb of memory above 4GB ignored
> 
> and then if I check
> 
> real memory  = 3757965312 (3583 MB)
> avail memory = 3678597120 (3508 MB)

You need to enable remapping in the BIOS.

The memory between 3-4 GB is partly taken by device space.  So you
have to re-map that actual RAM there to a position above 4 GB - which
is what the BIOS does.

Once the memory is above 4 GB you need a 64 bit kernel or a 32 bit
kernel with PAE enabled to use it.

Works fine for me on several machines, BTW.  But the remapping options
in the BIOSes are often broken.

Martin
-- 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Martin Cracauer <cracauer@cons.org>   http://www.cons.org/cracauer/
FreeBSD - where you want to go, today.      http://www.freebsd.org/