linux-kernel - Re: memory remapping, 4gb memory on 945gt

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Message-ID: <p73lk758sri.fsf@bingen.suse.de>
Date:	Fri, 04 Jan 2008 17:22:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	felix-linuxkernel@...e.de
Cc:	linux-kernel@...r.kernel.org
Subject: Re: memory remapping, 4gb memory on 945gt

felix-linuxkernel@...e.de writes:

> I recently put 4 GB of memory in my Acer Travelmate 8210 series
> notebook.  The BIOS only detects 3 GB.

Actually it will detect 4GB, but put the PCI hole over the last GB.
One way to get more usable memory is to configure the BIOS to use a smaller
PCI hole (e.g. use smaller frame buffer/aperture etc.)

> I googled around a little.  It appears to be a chipset limitation of the
> 945gt, which uses the fourth gig for devices.
>
> Now I can understand this explanation for 32-bit mode, but I'm running
> in 64-bit mode.  There should be a way to use the fourth gig under
> Linux.  Is there?

The chipset limitation applies to 64bit mode as well as to 32bit mode
(which actually does not have a 4GB limitation with PAE)

-Andi
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