[ltp] Re: Only 3 out of 4 GB detected

Frank Fiene linux-thinkpad@linux-thinkpad.org
Fri, 30 May 2008 15:25:13 +0200


On Freitag 30 Mai 2008, Marcus Better wrote:
> Stephan Groß wrote:
> > Please check your model number. AFAIK the 944* and 945* series only
> > support up to 3 GB. Only the 946* series can be extended to 4 GB.
>
> Argh, it's a 9456. :-( Thanks for the info.
>
> <rant>
> What were they thinking? "Nobody is going to need more than 3 GB,
> right?" </rant>

It's a problem with PCI bus and this chipset. It doesn't matter if 64bit 
is installed or 32bit-PAE.

PCI DMA is shown in the area above 3GB, so also if there is some memory 
free for instance from 3.5 - 4GB, the chipset cannot use it.

And funny is: my BIOS (Z61p) says: 4GB!

Frank
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