Intel Extensible Firmware Interface - PCI Address

Extensible Firmware Interface Specification
142 12/12/00 Version 1.02
Table 6-1. PCI Address
Mnemonic
Byte
Offset
Byte
Length Description
Register 0 1 The register number on the function.
Function 1 1 The function on the device.
Device 2 1 The device on the bus.
Bus 3 1 The bus.
Segment 4 1 The segment number.
Reserved 5 3 Must be zero.
Status Codes Returned
EFI_SUCCESS
The data was read from or written to the device
.
EFI_UNSUPPORTED
The
Address is not valid for this system.
EFI_INVALID_PARAMETER
Width or Count, or both, were invalid.
EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.