Re: 2.6.13-rc6-git10 test report [x86_64](WITHOUT NVIDIA MODULE)

Andi Kleen
2005-08-19T15:46:41Z

On Fri, Aug 19, 2005 at 08:38:25AM -0700, Peter Buckingham wrote:
> Hi Sean,
>
> Sean Bruno wrote:
> >Well, I do have IOMMU enabled in my kernel .config. I have attached it
> >to this message as well. I would appreciate any guidance as I pretty
> >much have no idea what 99% of the items in here are for. This is
> >the .config that I used to build the kernel from the dmesg output that
> >is attached to this email.
>
> the error that you see is because you haven't set a big enough size in
> the BIOS for the IOMMU. The error message is just saying that the kernel
> is enabling the IOMMU anyway. It used to be that it would enable 64MB,
> it looks like it's defaulting now to 256MB. When you enable a big enough
> size in the bios this error will go away (assuming that your bios fills
> in the registers correctly).

At least his original error message can only happen when CONFIG_GART_IOMMU
is disabled.

PCI-DMA: More that 4GB of RAM and no IOMMU
PCI-DMA: 32bit PCI IO may malfunction.<6>PCI-DMA: Disabling IOMMU

-Andi