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[PATCH] x86-64: improved iommu documentation

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- add SWIOTLB config help text
- mention Documentation/x86_64/boot-options.txt in
  Documentation/kernel-parameters.txt
- remove the duplication of the iommu kernel parameter documentation.
- Better explanation of some of the iommu kernel parameter options.
- "32MB<<order" instead of "32MB^order".
- Mention the default "order" value.
- list the four existing PCI-DMA mapping implementations of arch x86_64
- group the iommu= option keywords by PCI-DMA mapping implementation.
- Distinguish iommu= option keywords from number arguments.
- Explain the meaning of DAC and SAC.

Signed-off-by: Karsten Weiss <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Muli Ben-Yehuda <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Karsten Weiss 2007-02-13 13:26:21 +01:00 • committed by Andi Kleen
commit 5558870bfb
4 changed files with 90 additions and 60 deletions
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3
Documentation/kernel-parameters.txt
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@ -104,6 +104,9 @@ loader, and have no meaning to the kernel directly.
Do not modify the syntax of boot loader parameters without extreme
need or coordination with <Documentation/i386/boot.txt>.
There are also arch-specific kernel-parameters not documented here.
See for example <Documentation/x86_64/boot-options.txt>.
Note that ALL kernel parameters listed below are CASE SENSITIVE, and that
a trailing = on the name of any parameter states that that parameter will
be entered as an environment variable, whereas its absence indicates that