linux-kernel - Re: PCI resource problems caused by improper address rounding

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Date:	Tue, 18 Dec 2007 19:55:37 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Robert Hancock <hancockr@...w.ca>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Richard Henderson <rth@...ddle.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Daniel Ritz <daniel.ritz@....ch>, Greg KH <greg@...ah.com>,
	Keith Packard <keithp@...thp.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: PCI resource problems caused by improper address rounding

On 12/18/2007 07:11 PM, Robert Hancock wrote:
>> However, I wonder about that
>>
>>     e0000000-efffffff : pnp 00:0b
>>
>> thing. I actually suspect that that whole allocation is literally
>> *meant* for that 256MB graphics aperture, but the kernel explicitly
>> avoids it because it's listed in the PnP tables.
> 
> That is probably the MMCONFIG aperture, in that case any attempt to map
> the graphics BAR there will have disastrous results. (This BIOS has an
> MCFG table, though it looks like this Fedora kernel has MMCONFIG
> disabled, so we can't tell what it actually contains.)
> 

You can boot with "pci=mmconf" to enable it.

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