Re: PCI Express MMCONFIG and BIOS Bug messages..

Robert Han*** wrote:
I've seen a lot of systems (including brand new Xeon-based servers from
IBM and HP) that output messages on boot like:

PCI: BIOS Bug: MCFG area at f0000000 is not E820-reserved
PCI: Not using MMCONFIG.


So Microsoft is explicitly telling the BIOS developers that there is no
need to reserve the MMCONFIG space in the E820 table because Windows
doesn't care. On that basis it doesn't seem like a valid check to
require it to be so reserved, then.

Really, I think we should be basing this check on whether the
corresponding memory range is reserved in the ACPI resources, like
Windows expects. This does require putting more fingers into ACPI from
this early boot stage, though..


Intel had posted patches to do exactly that, but they were rejected.
I don't remember why now...
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