Biostar TA870+ User Manual download pdf (Page 46)

Motherboard Manual

6.4 AMI BIOS POST CODE

Checkpoint Description

Disable NMI, Parity, video for EGA, and DMA controllers. Initialize BIOS,

POST, Runtime data area . Also initialize B IOS 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. Initiali ze CH-0 as system timer. Install the

POSTINT1Ch handler. Enable IRQ-0 in P IC for system timer interrupt.

Traps INT1Ch vector to "POSTINT1ChHandlerBlock."

07 Fixes CPU POST interface calling pointer.

Initiali zes 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.

C1 Set up boot strap processor Information.

C2 Set up boot strap processor for POST.

C5 Enumerate and set up application processors.

C6 Re-enable cache for boot strap processor.

C7 Early CPU Init Exit.

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.

Testing and initialization of different Input Devices. Also, update the Kernel

Variables.

Traps the INT09h vector, so that the POST INT09h handler ge ts control for

IRQ1. Uncompress all available language, BIOS logo, and Silent logo

modules.

13 Early POST initialization of chipset registers.

20 Relocate System Management Interrupt vector for all CPU in the system.

Uncompress and i nitialize any platform specific BIOS mod ules. GPNV is

initialized at this checkpoint.

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.

2E Initializes all the output devices.

Allocate memory for ADM mod ule and uncompress it. Give control to ADM

module for initialization. Initialize language and font modules for ADM.

Activate ADM module.

Initializes the silent boot module. Set the window for displaying text

information.

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Biostar TA870+ User Manual Page 46

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