C-2. Ide Disk Device Path - Intel Extensible Firmware Interface Specification

Extensible Firmware Interface Specification
The EFI Device Path for the PCI IDE controller would contain entries for the following things:
•
Root PCI Bridge. ACPI Device Path _HID PNP0A03, _UID 0. ACPI name space \_SB\PCI0
•
PCI IDE controller. PCI Device Path with device and function of the IDE controller. ACPI
name space \_SB\PCI0\IDE0
•
ATA Address. ATA Messaging Device Path for Primary bus and Master device. ACPI name
space \_SB\PCI0\IDE0\PRIM\MAST
•
End Device Path
Table C-2. IDE Disk Device Path
Byte Byte
Offset Length
0 1
1 1
2 2
4 4
8 4
C 1
D 1
E 2
10 1
11 1
12 1
13 1
14 2
16 1
17 1
18 2
1A 1
1B 1
1C 2
340
Data Description
0x02 Generic Device Path Header – Type ACPI Device Path
0x01 Sub type – ACPI Device Path
0x0C Length
0x41D0, _HID PNP0A03 – 0x41D0 represents a compressed string 'PNP' and is in
the low order bytes
0x0A03
0x0000 _UID
0x01 Generic Device Path Header – Type Hardware Device Path
0x01 Sub type PCI Device Path
0x06 Length
0x01 PCI Function
0x10 PCI Device
0x03 Generic Device Path Header – Messaging Device Path
0x01 Sub type – ATAPI Device Path
0x06 Length
0x00 Primary =0, Secondary = 1
0x00 Master = 0, Slave = 1
0x0000 LUN
0xFF Generic Device Path Header – Type End Device Path
0xFF Sub type – End Device Path
0x04 Length
12/12/00 Version 1.02