Messages in this thread | | | Date | Sun, 30 Oct 2005 13:26:19 -0800 | From | Nishanth Aravamudan <> | Subject | Re: PCI-DMA: high address but no IOMMU |
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On 30.10.2005 [15:59:15 +0100], Andi Kleen wrote: > On Sunday 30 October 2005 15:29, Nishanth Aravamudan wrote: > > > > > Ah, silly me, I set IOMMU_DEBUG to Y at some point without realizing. > > Taking that away removed the issues and I now only get: > > > > [ 0.000000] Checking aperture... > > [ 0.000000] CPU 0: aperture @ 4000000 size 32 MB > > [ 0.000000] Aperture from northbridge cpu 0 too small (32 MB) > > [ 0.000000] No AGP bridge found > > > > ... > > > > [ 47.737770] PCI-DMA: Disabling IOMMU. > > > > Which makes a lot more sense. > > And everything works when you disable IOMMU_DEBUG? Is that the case > with the other reporters of this problem too?
Sorry, I realize in retrospect that my post may have been misleading. I was only commenting that I was seeing the same messages (but not the same "Kernel panic - not syncing: PCI-DMA: high address but no IOMMU.") So it works with either IOMMU_DEBUG (which I guess forces the IOMMU on? -- hence the output of "PCI-DMA: More than 4GB of RAM and no IOMMU"?) or not. Also note that I only have 2 GB of RAM, so I believe the kernel made the right decision in disabling the IOMMU (which is used with more than 3 GB of RAM?) Still, if Michael has IOMMU_DEBUG enabled, it might change things.
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