Messages in this thread | | | Date | Thu, 27 Oct 2005 10:57:06 -0700 | From | Nish Aravamudan <> | Subject | Re: PCI-DMA: high address but no IOMMU |
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On 10/27/05, Michael Madore <michael.madore@gmail.com> wrote: > Hi, > > I am seeing the following errors in /var/log/messages when booting > 2.6.14-rc5 on a dual Opteron nforce4 motherboard with 8GB of RAM: > > Checking aperture... > CPU 0: aperture @ be8c000000 size 32 MB > Aperture from northbridge cpu 0 too small (32 MB) > No AGP bridge found > 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 > Mapping aperture over 65536 KB of RAM @ 8000000 > > ... > > PCI-DMA: Disabling AGP. > PCI-DMA: More than 4GB of RAM and no IOMMU > PCI-DMA: 32bit PCI IO may malfunction.<6>PCI-DMA: Disabling IOMMU.
I get the same message on my 2-way Opteron machine (ASUS K8N-DL mobo), but I only have 2 GB of RAM :/ Seems odd the PCI-DMA subsystem thinks I have more than 4 :) Anybody have any ideas?
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