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

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Message-ID: <kjmd4wxz822.fsf@pelargir.dolphinics.no>
Date:	Wed, 05 Sep 2007 13:05:25 +0200
From:	Arne Georg Gleditsch <argggh@...phinics.no>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Robert Richter <robert.richter@....com>,
	Andreas Herrmann <andreas.herrmann3@....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

"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.
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