Table of Contents
Advertisement
POST Code Checkpoints
The POST 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
33
65
Disable NIMI,Parity, video for EGA, and DMA controllers. Initialize BIOS, POST,
and Runtime data area. Also initialize BIOS modules on POST entry and GPNV
area. Initialize 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.
Program the keyboard controller command byte is being done after Auto
detection of KB/MS using AMI KB-5.
Early CPU Init Star--Disable Cache -- Init Loal 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 lnit Exit
Initializes the 8042 compatible Keyboard Controller
Detects the processor 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 INT9h 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.
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
module for initialization. Initialize language and font modules for ADM.
Activate ADM moudle.
Initializes the silent boot module. Set the window for displaying text information.
Description
Altos G310
Advertisement
Table of Contents
