Specifications
AMD Geode™ GeodeROM Functional Specification 81
PCI Support
32087C
7.1.5.4 Subfunction 0Bh - Write Config BYTE
Description:
Writes one BYTE to the configuration space of the caller-specified PCI device.
Passed:
Returns:
7.1.5.5 Subfunction 0Ch - Write Config WORD
Description:
Writes one WORD to the configuration space of the caller-specified PCI device.
Passed:
Returns:
Parameter Description
AH B1h (PCI Function ID)
AL 0Bh (Write Config BYTE)
BH Bus number on which the device resides
BL Bits [7:3] = Device number
Bits [2:0] = Device function number
CL Byte value to write to configuration space
DI Register index (0-FFh) within the device’s or function’s configuration space
Parameter Description
CF Function completion status:
0 if function completed successfully
1 if an error occurred, AH contains error code
AH Function return status codes: See AH in Section 7.1.2 "Subfunction 02h - Find PCI Device" on page
76.
Parameter Description
AH B1h (PCI Function ID)
AL 0Ch (Write Config WORD)
BH Bus number on which the device resides
BL Bits [7:3] = Device number
Bits [2:0] = Device function number
CX WORD value to write to configuration space
DI Register index (0-FFh) within the device’s or function’s configuration space
Parameter Description
CF Function completion status:
0 if function completed successfully
1 if an error occurred
AH Function return status codes: See AH in Section 7.1.2 "Subfunction 02h - Find PCI Device" on page
76.