Re: what is MCFG area ?

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On Wed, 2006-06-07 at 06:15 +0200, Pavel Troller wrote:
> > 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.
> 
> 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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