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Old 12-09-2008, 03:38 PM   #1
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What does pci=nommconf do?

Can anyone explain to me what this flag does exactly and how it works please. Thanks
Old 12-09-2008, 06:11 PM   #2
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According to Documentation/kernel_parameters.txt:


nommconf [X86-32,X86_64]
Disable use of MMCONFIG for PCI Configuration
This would normally be used only if you had some broken device on your PCI-bus... something with incorrect MCFG information in it.
Old 12-09-2008, 08:01 PM   #3
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mmconf is for memory mapped config space. pci=nommconf is not needed in most cases, but can resolve some issues if you have a buggy BIOS. Newer kernels seem to be able to work around a bad mmconf configuration from BIOS, it use to be that the kernel would hang with a bad mmconf and the pci=nommconf would work around that.


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