ACPI defines an MCFG table that gives us the pointer to where the
extended PCI-X/PCI-Express configuration space exists. We validate
this region today by making sure that the reported range is marked
as reserved in the int 15 E820 memory map. However, the PCI firmware
spec states this is optional and BIOS should be reporting the MCFG
range as a motherboard resources. Several of my systems failed the
existing check and ended up without extended PCI-Express config
space. This patch extends the verification to also look for the
MCFG range as a motherboard resource in ACPI. This solves the
problem on my i386 as well as x86_64 test systems.
Rajesh
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