Messages in this thread | | | Date | Fri, 10 Nov 2006 08:56:00 -0500 | From | Jeff Garzik <> | Subject | Re: [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3) |
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Linus Torvalds wrote: > We really should stop using MMCONFIG entirely, until we have a > per-southbridge true knowledge of what the real decoding is. The BIOS > tables for this are simply too damn unreliable.
FWIW: MMCONFIG is required for PCI domain support (or "PCI segments" as ACPI calls them). Only a few mass market OEM boxes exist that need this -- and they are all pretty new (Opteron multi-core) -- but more are coming.
I have a patch in -mm that works for this. Without the patch, my sata_mv card and the machine's built-in MPT-Fusion do not appear at all in PCI bus scans (nor do the associated hard drives) on this production HP box. So far these machines are rare, /usually/ with a BIOS switch to turn off PCI domains.
This says nothing about BIOS table reliability, of course. I agree that MMCONFIG probing is highly unreliable at present. Whitelisting "<2007" systems like Andi proposed may be the only option in some cases.
Jeff
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