linux-kernel - Re: How to make all of 4GB of memory available?

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Date:	Wed, 01 Oct 2008 15:38:06 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Gene Heskett <gene.heskett@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: How to make all of 4GB of memory available?

Gene Heskett wrote:
> Greetings;
>
> New mobo, 4 core AMD Phenom cpu & 4 GB of dram.  I cannot find the switch in a 
> make xconfig that will allow use of all of it, I am only seeing 3GB.
>
> Am I going blind in my dotage?

Does it all appear in the e820 map?  If not, then the chipset is 
probably masking it; check to see if there's any likely-looking BIOS 
options to make it appear.

I assume you're compiling for either 32-bit PAE or 64-bit.  If you're 
compiling 32-bit without PAE (HIGHMEM64G) then the remaining Gbyte may 
simply be above 4G and out of the kernel's reach.

    J
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