Intel 253668-032US User Manual
Vol. 3 9-57
PROCESSOR MANAGEMENT AND INITIALIZATION
9.11.8.6 Function 01H—Write Microcode Update Data
This function integrates a new microcode update into the BIOS storage device. Table
9-14 lists the parameters and return codes for the function.
9-14 lists the parameters and return codes for the function.
Table 9-14. Parameters for the Write Update Data Function
Input
AX
AX
Function Code
0D042H
BL
Sub-function
01H - Write update
ES:DI
Update Address
Real Mode pointer to the Intel Update structure. This
buffer is 2048 bytes in length if the processor supports
only fixed-size microcode update or...
Real Mode pointer to the Intel Update structure. This
buffer is 64 KBytes in length if the processor supports a
variable-size microcode update.
CX
Scratch Pad1
Real mode segment address of 64 KBytes of RAM block
DX
Scratch Pad2
Real mode segment address of 64 KBytes of RAM block
SI
Scratch Pad3
Real mode segment address of 64 KBytes of RAM block
SS:SP
Stack pointer
32 KBytes of stack minimum
Output
CF
CF
Carry Flag
Carry Set - Failure - AH Contains status
Carry Clear - All return values valid
Carry Clear - All return values valid
AH
Return Code
Status of the call
AL
OEM Error
Additional OEM information
Return Codes (see Table 9-18 for code definitions
SUCCESS
SUCCESS
The function completed successfully.
NOT_IMPLEMENTED
The function is not implemented.
WRITE_FAILURE
A failure occurred because of the inability to write the
storage device.
ERASE_FAILURE
A failure occurred because of the inability to erase the
storage device.
READ_FAILURE
A failure occurred because of the inability to read the
storage device.
STORAGE_FULL
The BIOS non-volatile storage area is unable to
accommodate the update because all available update
blocks are filled with updates that are needed for
processors in the system.