linux-kernel - Re: PCI BIOS Bug messages

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Message-id: <45A45545.2040002@shaw.ca>
Date:	Tue, 09 Jan 2007 20:53:57 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Vasudevan S <savasude@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCI BIOS Bug messages

Vasudevan S wrote:
> I run Fedora Core 6 on the 'compaq nc6320' laptop. I am using the
> '2.6.19.1' kernel.
> 
> While booting the kernel, I noticed the following error message:
> 
> PCI: BIOS Bug: MCFG area at f8000000 is not E820-reserved
> PCI: Not using MMCONFIG.
> 
> After some search, I commented out the 'e820_all_mapped()' check in
> the 'pci_mmcfg_init()' function. I no longer see this message and MMCONFIG
> method seems to be used now.
> 
> Is this the right thing to do?

Maybe on that box you can get away with it, but I believe the purpose of 
the check is to weed out BIOSes that have totally broken MCFG tables. I 
think there is some work going on to be able to check and/or bash the 
chipset registers manually on various chipsets to reduce our reliance on 
the BIOS getting this right..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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