Post Code Checkpoints - ECS A785GM-M Manual

POST Code Checkpoints

The POST code checkpoints are the largest set of checkpoints during the BIOS pre-
boot process. The following table describes the type of checkpoints that may occur
during the POST portion of the BIOS :
Checkpoint
03
04
05
06
08
C0
C1
C2
C5
C6
C7
0A
0B
0C
0E
13
24
30
2A
2C
2E
31
Description
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."
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
Initializes the interrupt controlling hardware (generally PIC) and interrupt
vector table.
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."
Initializes the CPU. The BAT test is being done on KBC.
keyboard controller command byte is being done after Auto detection of
KB/MS using AMI KB-5.
Early CPU Init Start -- Disable Cache - Init Local APIC
Set up boot strap processor Information
Set up boot strap processor for POST
Enumerate and set up application processors
Re-enable cache for boot strap processor
Early CPU Init Exit
Initializes the 8042 compatible Key Board Controller.
Detects the presence of PS/2 mouse.
Detects the presence of Keyboard in KBC port.
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.
Early POST initialization of chipset registers.
Uncompress and initialize any platform specific BIOS modules.
Initialize System Management Interrupt.
Initializes different devices through DIM.
See DIM Code Checkpoints section of document for more information.
Initializes different devices. Detects and initializes the video adapter
installed in the system that have optional ROMs.
Initializes all the output devices.
Allocate memory for ADM module and uncompress it. Give control to ADM
89
Program the