Re: [PATCH -mm] 0/2: PCI MMCONFIG-related updates

[Robert Hancock]

Jesse Barnes wrote:
> On Tuesday, May 29, 2007 9:01:22 Robert Hancock wrote:
> > These two patches implement some changes in behavior related to PCI
> > MMCONFIG configuration space access. One changes the way in which we
> > validate the MCFG table provided by the BIOS by checking it against
> > ACPI motherboard resources instead of the E820 table. The BIOS is not
> > required to reserve this area in the E820 table, so checking that
> > results in MMCONFIG being unnecessarily disabled on some machines.
> >
> > Some Intel chipsets where MMCONFIG was being disabled previously
> > (but won't be with the first patch) had problems, not due to the
> > MCFG table being broken, but because the access was hosed by the way
> > in which we do PCI BAR sizing. The second patch fixes this problem.
> >
> > This is requested for inclusion in the -mm tree for testing.
>
> Robert, should we also pull in the 915 and 965 chipset specific register 
> poking code?  It might be a good sanity check against ACPI (i.e. if ACPI and 
> the actual register window disagree, we can assume the BIOS is broken and 
> MCFG is not safe to use).  If so, I'll update and repost them against your 
> patchset.

Probably not a bad idea..

--
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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