what is MCFG area ?

http://lkml.org/lkml/2006/3/23/213

On my buggy computer i get
cat dmesg09 | grep "MM\|MCFG"
ACPI: MCFG (v001 A M I OEMMCFG 0x05000602 MSFT 0x00000097) @ 0x000000003ffb0410
PCI: BIOS Bug: MCFG area is not E820-reserved
PCI: Not using MMCONFIG.
PCI-DMA: Disabling IOMMU.

Should ACPI read MCFG area ?

Thanks,

Sérgio M. B.

I'm getting exactly the same messages, just the numbers in the MCFG line are different:

root@arcus:~# dmesg | grep  "MM\|MCFG"
ACPI: MCFG (v001 A M I  OEMMCFG  0x11000524 MSFT 0x00000097) @ 0x000000003f7d03f0
PCI: BIOS Bug: MCFG area is not E820-reserved
PCI: Not using MMCONFIG.
PCI-DMA: Disabling IOMMU.

It's on a MSI motherboard with Intel 945 chipset (MS-7210). The machine otherwise works very well.
The "Disabling IOMMU" message I'm getting also on another, Nvidia NF4/Opteron
based board, without this MCFG bug. I think it's unrelated and because Linux properly detected the BIOS bug and probably fixed it, I think the MCFG message is harmless.
With regards, Pavel Troller

yes, IOMMU is a different thing some AGPs have it. But I don't what is too.

Sérgio M. B.

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