linux-kernel - Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

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Message-Id: <200808302129.24584.rjw@sisk.pl>
Date:	Sat, 30 Aug 2008 21:29:23 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	David Witbrodt <dawitbro@...global.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers <kernel-testers@...r.kernel.org>
Subject: Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

On Saturday, 30 of August 2008, Linus Torvalds wrote:
> 
> On Sat, 30 Aug 2008, Linus Torvalds wrote:
> > 
> > We simply shouldn't try to compare the BAR start with randomly chosen 
> > things.
> 
> Btw, looking at that bogus BAR#3 some more: I don't actually think it's 
> even an MCFG resource.
> 
> I think it's literally the resource that describes the HT window for the 
> host bridge. So it's literally like the "root" resource - all external 
> MMIO resources that go over HT have to be in that window.
> 
> IOW, I'm starting to think that it's not even broken. It is probably 
> perfectly real. It's not a "PCI bridge" in the sense that it doesn't 
> bridge one PCI bus to another, but it's a host bridge, and it bridges the 
> CPU memory accesses to another bus. 
> 
> The fact that the MCFG area happens to be at the start of that window is 
> probably just a random detail.
> 
> Does anybody know how to find chipset docs for AMD/ATI chipsets? I find 
> CPU docs, and the GPU docs, but not the 790 chipset docs anywhere (yeah, 
> it looks promising with a link that says "AMD 790FX Chipset 
> Specifications", but the link just takes you to some trivial overview, not 
> any actual specs.
> 
> Anybody?

There are some at:
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_739_15137,00.html

Well, that's 690/SB600 only and I'm not sure how useful this is.

Thanks,
Rafael
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