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Chapter 4 55
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.
NOTE: Please note that checkpoints may differ between different platforms based on system configuration.
Checkpoints may change due to vendor requirements, system chipset or option ROMs from add-in PCI
devices.
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."
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.
0A Initializes the 8042 compatible Key Board Controller.
0B Detects the presence of PS/2 mouse.
0C Detects the presence of Keyboard in KBC port.
0E Testing and initialization of different Input Devices. Also, update the Kernel
Variables.
Traps the INT09h vector, so that the POST INT09h handler gets control for IRQ1.
Uncompress all available language, BIOS logo, and Silent logo modules.
13 Early POST initialization of chipset registers.
24 Uncompress and initialize any platform specific BIOS modules. GPNV is initialized
at this checkpoint.
30 Initialize System Management Interrupt.
2A Initializes different devices through DIM.
See DIM Code Checkpoints section for more information.
2C Initializes different devices. Detects and initializes the video adapter installed in the
system that have optional ROMs.
2E Initializes all the output devices.
31 Allocate memory for ADM module and uncompress it. Give control to ADM module
for initialization. Initialize language and font modules for ADM. Activate ADM
module.
33 Initializes the silent boot module. Set the window for displaying text information.
37 Displaying sign-on message, CPU information, setup key message, and any OEM
specific information.
38 Initializes different devices through DIM. See DIM Code Checkpoints section for
more information. USB controllers are initialized at this point.
39 Initializes DMAC-1 & DMAC-2.