Messages in this thread | | | From | Jesse Barnes <> | Subject | Re: pci-disable-decode-of-io-memory-during-bar-sizing.patch | Date | Tue, 30 Oct 2007 15:39:17 -0700 |
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On Tuesday, October 30, 2007 3:38 pm Linus Torvalds wrote: > On Tue, 30 Oct 2007, Linus Torvalds wrote: > > No. You really don't see the big picture. There's been tons of > > problems with MMCONFIG. Like the fact that other devices have their > > IO regions registered on top of it, because the MMCONFIG thing was > > done as a hidden resource. Or the fact that the area claimed was > > too small. Or too large. Or not listed at all. > > Actually, I guess the bad case wasn't "not listed at all", but > incorrectly listed - so the probing would go to the wrong address, > not find any devices, and then promptly result in an unusable machine > with no hardware attached.
Yeah, busted BIOS (and I agree a poor design decision).
> I _think_ (and hope) those machines were never released. But even > now, on my main machine, I get "MCFG area at f0000000 is not > E820-reserved", and probably the only reason the PCI layer doesn't > overwrite it is because it does show up as a PnP region, and I have > pnp support enabled.
Unfortunately I think some such machines *were* released, only because the release engineers figured no one actually uses MMCONFIG yet (Windows == whole world of users), so why worry about that particular bug?
The "not E820-reserved" message is actually bogus. I'll bet MMCONFIG works fine on your machine with Robert's patch and the disable decode stuff applied.
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