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45 Chapter 4
C0 Early CPU Init Start -- Disable Cache ?C 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.
24 Uncompress and initialize any platform specific BIOS modules. GPNV is initialized at this
checkpoint.
30 Initialize System Management Interrupt.
2A
Initializes different devices through DIM. See DIM Code Checkpoints section of document
for more information.
2C nitializes 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. See DIM Code Checkpoints section of document
for more information. 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.
50 Programming the memory hole or any kind of implementation that needs an adjustment in
system RAM size if needed.
Checkpoint Description