BIOS Beep Codes and Checkpoints
68
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.”
07 Fixes CPU POST interface calling pointer.
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 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.
20 Relocate System Management Interrupt vector for all CPU in the system.
24 Uncompress and initialize any platform specific BIOS modules. GPNV is initialized at this
checkpoint.
2A Initializes different devices through DIM.
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. USB controllers are initialized at this point.
39 Initializes DMAC-1 & DMAC-2.
3A Initialize RTC date/time.
3B Test for total memory installed in the system. Also, Check for DEL or ESC keys to limit memory test.
Display total memory in the system.
3C Mid-POST initialization of chipset registers.
40 Detect different devices (parallel ports, serial ports, and coprocessor in CPU, etc.) successfully
installed in the system and update the BDA, EBDA, etc.
Table 62. POST code checkpoints (Continued)
Checkpoint Description
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