[FoLUG] IOMMU option in the BIOS

[Enrico Placci]

On Tue, 04 Apr 2006 15:50:04 +0000
CyberPenguin <giov.abb@inwind.it> wrote:

> Ciao,
> nell'output di dmesg trovo (anche) scritto quanto segue:
> ...
> Aperture from northbridge cpu 0 too small (32 MB)
> AGP bridge at 00:00:00
> Aperture from AGP @ f0000000 size 4096 MB (APSIZE 0)
> Aperture from AGP bridge too small (0 MB)
> Your BIOS doesn't leave a aperture memory hole
> Please enable the IOMMU option in the BIOS setup
> This costs you 64 MB of RAM
> ...
> agpgart: Detected AGP bridge 0
> agpgart: Aperture conflicts with PCI mapping.
> agpgart: Aperture from AGP @ f0000000 size 4096 MB
> agpgart: Aperture too small (0 MB)
> agpgart: No usable aperture found.
> agpgart: Consider rebooting with iommu=memaper=2 to get a good
> aperture. PCI-DMA: Disabling IOMMU.
> ...
> 
> a quali problemi si riferisce lo stralcio di output?
> 

Prova a cercare nel bios un'opzione tipo AGP Aperture size e mettila a
64 MB. 

HTH

Enrico