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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