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Windows 2008/VIsta use which way to get PCI slot number in the board?

As I know, there are 2 methords for BIOS report PCI slot number to OS:
- $PIR table defined in PCI spec
- ACPI _SUN object
I want to know that Windows use which one to get the slot number? We meet a bug that Win2003 show slot number correctly, but win2008 can't.

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