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).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 |
Last modified 2yr ago