Kontron AM5010 BIOS - Manual (Page 113)

AM4010/AM4011/AM5010 BIOS POST Codes
ID 1022-2060, Rev. 2.0 Page 103
POST Code Checkpoints
The POST code checkpoints are the largest set of checkpoints during the BIOS pre-boot pro-
cess. 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 the CMOS with the Fail-Safe values and clear passwords. Initialize status reg-
ister 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.
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 Keyboard 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. Uncom-
press 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.
30 Initialize System Management Interrupt.
2A Initializes different devices through DIM.
See DIM Code Checkpoints section of document for more information.
2C Initializes different devices. Detects and initializes the video adapter installed in the system
that has optional ROMs.
2E Initializes all the output devices.