21.1.4 ATA Device Paths

The table below shows an example device path for a ATA host controller that supports a single SCSI channel and is located at PCI device number 0x07 and PCI function 0x00 The PCI SCSI host controller is directly attached to a PCI root bridge.

This sample device path consists of an ACPI device path node, a PCI device path node, and a device path end structure. The _HID and _UID must match the ACPI table description of the PCI root bridge. The following is the shorthand notation for this device path: ACPI(PNP0A03,0)/PCI(7|0).

Table 34-SATA device path examples
Byte Offset Byte Length Data Description
0x00 0x01 0x02 Generic Device Path Header - Type ACPI Device Path
0x01 0x01 0x01 Sub type - ACPI Device Path
0x02 0x02 0x0C Length - 0x0C bytes
0x04 0x04 0x41D0, 0x0A03 _HID PNP0A03 - 0x41D0 represents a compressed string 'PNP' and is in the low-order bytes.
0x08 0x04 0x0000 _UID
0x0C 0x01 0x01 Generic Device Path Header - Type Hardware Device Path
0x0D 0x01 0x01 Sub type - PCI
0x0E 0x02 0x06 Length - 0x06 bytes
0x10 0x01 0x07 PCI Function
0x11 0x01 0x00 PCI Device
0x12 0x01 0xFF Generic Device Path Header - Type End of Hardware Device Path
0x13 0x01 0xFF Sub type - End of Entire Device Path
0x14 0x02 0x04 Length - 0x04 bytes