Messages in this thread | | | Date | Thu, 27 Oct 2005 10:47:38 -0700 | From | Michael Madore <> | Subject | PCI-DMA: high address but no IOMMU |
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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
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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.
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Attached scsi disk sda at scsi2, channel 0, id 0, lun 0 Kernel panic - not syncing: PCI-DMA: high address but no IOMMU.
With 2.6.13, the systems boots OK with these messages in the log:
Checking aperture... CPU 0: aperture @ 8000000 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: aperture base @ 8000000 size 65536 KB PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
Using git bisect, I narrowed the problem down to the following commit:
6142891a0c0209c91aa4a98f725de0d6e2ed4918 is first bad commit diff-tree 6142891a0c0209c91aa4a98f725de0d6e2ed4918 (from 357e11d4cbbbb959a88a9bdbbf33a10f160b0823) Author: Andi Kleen <ak@suse.de> Date: Mon Sep 12 18:49:24 2005 +0200
[PATCH] x86-64: Avoid unnecessary double bouncing for swiotlb
PCI_DMA_BUS_IS_PHYS has to be zero even when the GART IOMMU is disabled and the swiotlb is used. Otherwise the block layer does unnecessary double bouncing.
Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
:040000 040000 d704d51d1e05f508f09c4388d3199cafbb9e3018 6a40204fd8b954634f2f7ea8f84861ed0a4bd88e M include
Reverting this change allows 2.6.14-rc5 to boot.
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