Intel Extensible Firmware Interface - Manual (Page 238)

Extensible Firmware Interface Specification
8-18 12/01/02 Version 1.10
8.3.5.3 Vendor-Defined Media Device Path
Table 8-26. Vendor-Defined Media Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 4 – Media Device Path.
Sub-Type 1 1 Sub-Type 3 – 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.
8.3.5.4 File Path Media Device Path
Table 8-27. File Path Media Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 4 – Media Device Path.
Sub-Type 1 1 Sub-Type 4 – File Path.
Length 2 2 Length of this structure in bytes. Length is 4 + n bytes.
Path Name 4 n Unicode Path string including directory and file names. The
length of this string
n can be determined by subtracting 4
from the Length entry. A device path may contain one or
more of these nodes. The complete path to a file can be
found by concatenating all the File Path Media Device Path
nodes. This is typically used to describe the directory path
in one node, and the filename in another node.
8.3.5.5 Media Protocol Device Path
The Media Protocol Device Path is used to denote the protocol that is being used in a device path at
the location of the path specified. Many protocols are inherent to the style of device path.
Table 8-28. Media Protocol Media Device Path
Mnemonic Byte
Offset Byte
Length
Description
Type 0 1 Type 4 – Media Device Path.
Sub-Type 1 1 Sub-Type 5 – Media Protocol.
Length 2 2 Length of this structure in bytes. Length is 20 bytes.
Protocol GUID 4 16 The ID of the protocol.