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Message-Id: <200709031452.45434.ak@suse.de> Date: Mon, 3 Sep 2007 14:52:45 +0200 From: Andi Kleen <ak@...e.de> To: "Andreas Herrmann" <andreas.herrmann3@....com> Cc: "Robert Richter" <robert.richter@....com>, patches@...-64.org, linux-kernel@...r.kernel.org Subject: Re: [patches] [patch 3/5] x86: Add PCI extended config space access for AMD Barcelona > And unfortunately this is too often the case. On Barcelona systems? > See for instance Robert Hancock's patch http://lkml.org/lkml/2007/5/30/2 > to enable MMCONFIG access in certain cases where BIOS did not correctly > set up MCFG. Why are people working on such stuff if it is not serious > enough? I don't know why. I'm just not aware of any serious problems that are solved by extended config space access. Originally we had trouble because MCFG was wrong and the systems would not boot. Also there is one class of systems (some x86 Apples) where cf8 doesn't work, but MMCONFIG does. But that's all specific to older systems. > Barcelona just adds another way to access PCI ECS (besides MMCONFIG) and I > can't understand why this shouldn't be supported by Linux. It will be supported when the BIOS gets it right. > Do you have any suggestion how else to add support for PCI ECS access via > IO instructions for Barcelona? My suggestion is to rely on MMCONFIG for this. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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