linux-kernel - Re: [patches] [patch 3/5] x86: Add PCI extended config space access for AMD Barcelona

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Date:	Wed, 5 Sep 2007 18:13:00 +0200
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Arne Georg Gleditsch" <argggh@...phinics.no>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	"Robert Richter" <robert.richter@....com>,
	"Arjan van de Ven" <arjan@...radead.org>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patches] [patch 3/5] x86: Add PCI extended config space
 access for AMD Barcelona

On Wed, Sep 05, 2007 at 01:05:25PM +0200, Arne Georg Gleditsch wrote:
> "H. Peter Anvin" <hpa@...or.com> writes:
> > You're missing the point.   How will the PCI bus transactions be
> > different when using MMCONFIG versus your extended CF8 version?
> 
> Conceivably this is useful if the IO hub does not support MMCONFIG
> accesses.  The AMD 8111 does not, as far as I can see.  At least I
> have an Opteron system where MMCONFIG is not supported, and I assume
> it's because the 8111 doesn't provide it.  I don't know if this is
> going to be a realistic scenario for Barcelona systems.
> 
> -- 
> 								Arne.

Not sure how many AMD 8111 based systems are out there which are
upgradeable to Barcelona.

I guess the BIOS won't setup MCFG for systems with 8111/8131 
because both lack ECS MMIO Base Address Register. 
(Because 8111 and 8131 are not Mode2-PCI-X and PCI-express
capable.)

So if such a board is upgradeable, the way to access extended
config space of the northbridge functions is to use CF8/CFC
ECS access.


Regards,

Andreas

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