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How to make all of 4GB of memory available?

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From: Gene Heskett
Subject: How to make all of 4GB of memory available?
Date: Wednesday, October 1, 2008 - 11:17 am

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?

Thanks.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Elliptic paraboloids for sale.
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From: Chris Friesen
Subject: Re: How to make all of 4GB of memory available?
Date: Wednesday, October 1, 2008 - 11:28 am

Maybe post your .config file?

Chris

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From: Kasper Sandberg
Subject: Re: How to make all of 4GB of memory available?
Date: Wednesday, October 1, 2008 - 2:08 pm

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From: Jeremy Fitzhardinge
Subject: Re: How to make all of 4GB of memory available?
Date: Wednesday, October 1, 2008 - 3:38 pm

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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