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

Rafael J. Wysocki
2008-08-30T19:25:26Z

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