50
F3
Start reading the recovery file cluster by cluster.
F5
Disable L1 cache.
FA
Check the validity of the recovery file configuration to the current
configuration of the flash part.
FB
Make flash write enabled through chipset and OEM specific method. Detect
proper flash part. Verify that the found flash part size equals the recovery
file size.
F4
The recovery file size does not equal the found flash part size.
FC
Erase the flash part.
FD
Program the flash part.
FF
The flash has been updated successfully. Make flash write disabled.
Disable ATAPI hardware. Restore CPUID value back into register. Give
control to F000 ROM at F000:FFF0h.
POST Code Checkpoints
The POST code checkpoints are the largest set of checkpoints during the BIOS preboot
process. The following table describes the type of checkpoints that may occur
during the POST portion of the BIOS:
Checkpoint
Description
03
Disable NMI, Parity, video for EGA, and DMA controllers. Initialize BIOS,
POST, Runtime data area. Also initialize BIOS modules on POST entry and
GPNV area. Initialized CMOS as mentioned in the Kernel Variable
"wCMOSFlags."
04
Check CMOS diagnostic byte to determine if battery power is OK and CMOS
checksum is OK. Verify CMOS checksum manually by reading storage area.
If the CMOS checksum is bad, update CMOS with power-on default values
and clear passwords. Initialize status register A.
Initializes data variables that are based on CMOS setup questions.
Initializes both the 8259 compatible PICs in the system
05
Initializes the interrupt controlling hardware (generally PIC) and interrupt
vector table.
06
Do R/W test to CH-2 count reg. Initialize CH-0 as system timer. Install the
POSTINT1Ch handler. Enable IRQ-0 in PIC for system timer interrupt.
Traps INT1Ch vector to "POSTINT1ChHandlerBlock."
07
Fixes CPU POST interface calling pointer.
08
Initializes the CPU. The BAT test is being done on KBC. Program the
keyboard controller command byte is being done after Auto detection of
KB/MS using AMI KB-5.
C0
Early CPU Init Start -- Disable Cache – Init Local APIC
