RE: [gentoo-amd64] 4Gb of RAM Memory- High Memory

[Kris Kersey (Augustus)]

Your BIOS is only telling you how much memory you have installed.  It's 
not telling you how it's mapping other memory on top of it for 32-bit OS 
support.  You need to go into your BIOS and find a "memory remap" setting 
of some type.  If you find that, enable it.

Thanks,
Kris Kersey (Augustus)
LinuxHardware.org Site Manager
augustus@×××××××××××××.org
Gentoo Linux AMD64 Developer
augustus@g.o

On Wed, 17 May 2006, Juliano Morais Barbosa wrote:

> Hi for all.
>
> My BIOS show me 4Gb of memory in boot stages.
>
> But when SO enter is show me 3GB.
>
> My Machine is HP dx5150 see
> http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?&lang=en&cc=us&pro
> dTypeId=12454&prodSeriesId=457124&lang=en&cc=us
>
> -----Original Message-----
> From: Daniel Gryniewicz [mailto:dang@g.o]
> Sent: Wednesday, May 17, 2006 4:16 PM
> To: gentoo-amd64@l.g.o
> Subject: Re: [gentoo-amd64] 4Gb of RAM Memory- High Memory
>
> On Wed, 2006-05-17 at 15:43 -0300, Juliano Morais Barbosa wrote:
>> I have gentoo  2.6.16-gentoo-r1-Flexsolutions #1 SMP Thu Mar 30 08:21:07
> BRT
>> 2006 x86_64 AMD Athlon(tm) 64 Processor 3500+ AuthenticAMD GNU/Linux with
>> 4Gb of RAM but in top I see 3Gb, and the kernel don´t have option for High
>> Memory Option.
>>
>>
>
> This is a case of the motherboard reserving address space in the 32-bit
> range for things like AGP aperture, BIOS shadowing, and so on.  There is
> nothing linux can do about it.  You can either a) get the motherboard to
> shift the displaced RAM above 4G (many motherboards can do this), or b)
> get the motherboard to shift the address space reservations above 4G
> (I've only ever heard of one motherboard that can do this).  If you
> motherboard can do neither, then you must contact the manufacturer for a
> solution, or, at worst, buy a new motherboard.
>
> Daniel
>
>
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