Intel Extensible Firmware Interface - Manual (Page 226)

Extensible Firmware Interface Specification
8-6 12/01/02 Version 1.10
8.3.2.3 Memory Mapped Device Path
Table 8-5. Memory Mapped Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 1 – Hardware Device Path.
Sub-Type 1 1 Sub-Type 3 – Memory Mapped.
Length 2 2 Length of this structure in bytes. Length is 24 bytes.
Memory Type 4 4 EFI_MEMORY_TYPE . Type EFI_MEMORY_TYPE is
defined in the AllocatePages() function description.
Start Address 8 8 Starting Memory Address.
End Address 16 8 Ending Memory Address.
8.3.2.4 Vendor Device Path
The Vendor Device Path allows the creation of vendor-defined Device Paths. A vendor must
allocate a Vendor_GUID for a Device Path. The Vendor_GUID can then be used to define the
contents on the
n bytes that follow in the Vendor Device Path node.
Table 8-6. Vendor-Defined Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 1 – Hardware Device Path.
Sub-Type 1 1 Sub-Type 4 – Vendor.
Length 2 2 Length of this structure in bytes. Length is 20 + n bytes.
Vendor_GUID 4 16 Vendor-assigned GUID that defines the data that follows.
Vendor Defined Data 20 n Vendor-defined variable size data.
8.3.2.5 Controller Device Path
Table 8-7. Controller Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 1 – Hardware Device Path.
Sub-Type 1 1 Sub-Type 5 – Controller.
Length 2 2 Length of this structure in bytes. Length is 8 bytes.
Controller Number 4 4 Controller number.