Re: memory remapping, 4gb memory on 945gt

Andi Kleen
2008-01-04T16:23:12Z

felix-linuxkernel@fefe.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