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Protocols — PCI Bus Support
Version 1.10 12/01/02 12-45
Table 12-9 shows an example device path for a PCI Root Bridge using an Expanded ACPI Device
Path. This device path consists of an Expanded ACPI Device Path Node, and a Device Path End
Structure. The _UID and _CID fields must match the ACPI table description of the PCI Root
Bridge. For a system with only one PCI Root Bridge, the _UID value is usually 0x0000. The
shorthand notation for this device path is ACPI(12345678,0,PNP0A03).
Table 12-9. PCI Root Bridge Device Path Using Expanded ACPI Device Path
Byte
Offset
Byte
Length
Data
Description
0x00 0x01 0x02 – Type ACPI Device Path
0x01 0x01 0x02 Sub type – Expanded ACPI Device Path
0x02 0x02 0x10 Length – 0x10 bytes
0x04 0x04 _HID-device specific
0x08 0x04 0x0000 _UID
0x41D0,
0x0A03
_CID PNP0A03 – 0x41D0 represents a compressed string ‘PNP’ and is
in the low order bytes.
0x10 0x01 0xFF – Type End of Hardware Device Path
0x11 0x01 0xFF Sub type – End of Entire Device Path
0x12 0x02 0x04 Length – 0x04 bytes