CHAPTER 6: Troubleshooting

Check Description point

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 Initialize the 8042 compatible keyboard controller.

0B Detect the presence of PS/2 mouse.

0C Detect the presence of keyboard in KBC port.

0E Testing and initialization of different input devices. Also, update the Kernel Variables.

Trap 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.

24Uncompress and initialize any platform specific BIOS modules.

30Initialize System Management Interrupt.

2A

Initialize different devices through DIM.

 

See “DIM code checkpoints” on page 73 for more information.

 

 

2C

Initialize different devices. Detects and initializes the video adapter installed in the

 

system that has optional ROMs.

 

 

2E

Initialize all the output devices.

 

 

31Allocate 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 Initialize the silent boot module. Set the window for displaying text information.

37Displaying sign-on message, CPU information, setup key message, and any OEM-specific information.

38Initialize different devices through DIM. See “DIM code checkpoints” on page 73 for more information.

39Initialize DMAC-1 and DMAC-2.

3A Initialize RTC date/time.

3B Test for total memory installed in the system. Also, press DEL or ESC keys to limit memory test. Display total memory in the system.

3C Mid-POST initialization of chipset registers.

40Detect different devices (parallel ports, serial ports, and coprocessor in CPU, and so on) successfully installed in the system and update the BDA, EBDA, and so on.

50Programming the memory hole or any kind of implementation that needs an adjustment in system RAM size, if needed.

52Updates CMOS memory size from memory found in memory test. Allocates memory for Extended BIOS Data Area from base memory.

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