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On Tue, Feb 10, 2004 at 09:16:25AM +0100, Andreas Wohlfeld wrote:
> On Tue, Feb 10, 2004 at 09:03:30AM +0100, Lionel Elie Mamane wrote:

>> NForce3 150 Pro chipset) with 4GB of memory installed: The BIOS (and
>> thus Linux) recognises only between about 2.5GB and 3.5GB of RAM,

Forgot to say "as well a 32 bit Linux as a 64 bit Linux".

> You have to read the mainboard manual.

Funnily, I did, but somehow missed the one sentence that talks about

> It states that this is normal behavior due to memory space
> allocation of chips on the mainboard and graphics card.

> 4 GB minus 0.4 GB for mainboard chipset minus AGP apterture size
> sounds about right.

Well, it looks more like 0.4GB + 2*(AGP aperture): With a maximal
aperture (512MB), I have only about 2.5GB "left". With a minimal
aperture (32MB? 16MB? I'm not sure any more), I have about 3.5GB

> It's a limitation of the 32 bit architecture. It does not happen
> with server mainboards in 40 bit flat or 36 bit PSE mode.

Well, but then I would expect that a 64 bit Linux would go in 40 bit
flat mode. Do I need to pass it a special boot parameter for this? The
documentation claims that the board supports 8GB of memory, so there
must be _some_ way for the OS to access more than 4GB. Do the Opteron
CPU's support PSE at all? I thought it was an Intel-only thing.


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