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Extensible Firmware Interface Specification
12-100 12/01/02 Version 1.10
The field values for the EFI PCI Expansion ROM Header and the PCIR Data Structure would be as
follows in this recommended PCI Driver image layout. An image must start at a 512-byte
boundary, and the end of the image must be padded to the next 512-byte boundary.
Table 12-18. Recommended PCI Device Driver Layout
Offset
Byte
Length Value Description
0x00 1 0x55 ROM Signature, byte 1
0x01 1 0xAA ROM Signature, byte 2
0x02 2 XXXX Initialization Size – size of this image in units of 512 bytes. The size
includes this header
0x04 4 0x0EF1 Signature from EFI image header
0x08 2 XX
0x0B
0x0C
Subsystem Value from the PCI Driver's PE/COFF Image Header
Subsystem Value for an EFI Boot Service Driver
Subsystem Value for an EFI Runtime Driver
0x0a 2 XX
0x014C
0x0200
0x0EBC
Machine type from the PCI Driver's PE/COFF Image Header
IA-32 Machine Type
Itanium processor type
EFI Byte Code (EBC) Machine Type
0x0C 2 XXXX
0x0000
0x0001
Compression Type
Uncompressed
Compressed following the EFI 1.10 Compression Algorithm
Specification
0x0E 8 0x00 Reserved
0x16 2 0x0034 Offset to EFI Image
0x18 2 0x001C Offset to PCIR Data Structure
0x1A 2 0x0000 Padding to align PCIR Data Structure ona4byteboundary
0x1C 4 'PCIR' PCIR Data Structure Signature
0x20 2 XXXX Vendor ID from the PCI Controller's Configuration Header
0x22 2 XXXX Device ID from the PCI Controller's Configuration Header
0x24 2 0x0000 Reserved
0x26 2 0x0018 The length if the PCIR Data Structure in bytes
0x28 1 0x00 PCIR Data Structure Revision. Value for PCI 2.2 Option ROM
0x29 3 XXXX Class Code from the PCI Controller's Configuration Header
0x2C 2 XXXX Code Image Length in units of 512 bytes. Same as Initialization Size
0x2E 2 XXXX Revision Level of the Code/Data. This field is ignored
continued