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142 Chapter 4
0x22 Reset the keyboard. LBT Core
0x40 Test A20 line LBT Core
0x67 Quick initialization of all Application Processors in a multi-
processor system
LBT Core
0x32 Compute CPU speed. LBT Core
0x69 Initialize the handler for SMM. LBT Core
0x6B If CMOS is bad, load Custom Defaults from flash into CMOS. If
successful, reboot.
LBT Core
0x3C If CMOS is valid, load chipset registers with values from
CMOS, otherwise load defaults and display Setup prompt. If
Auto Configuration is enabled, always load the chipset
registers with the Setup defaults (Rel 6.0).
LBT Core
0x3D Load alternate registers with CMOS values LBT Core
0x42 Initialize interrupt vectors 0 thru 77h LBT Core
0x46 Verify the ROM copyright notice LBT Core
0x45 Initialize all motherboard devices. LBT Core
0x49 1. Size the PCI bus topology and set bridge bus numbers.
2. Set the system max bus number.
3. Write a 0 to the command register of every PCI device.
4. Write a 0 to all 6 base registers in every PCI device.
5. Write a -1 to the status register of every PC
LBT Core
0xC6 Initialize note dock LBT Core
0xC5 PnPnd dual CMOS (optional) LBT Core
0x48 Verify that the equipment specified in the CMOS matches the
hardware currently installed. If the monitor type is set to 00
then a video ROM must exist. If the monitor type is 1 or 2 set
the video switch to CGA. If monitor type 3, set the video switch
to m
LBT Core
0xD1 Initialize BIOS stack LBT Core
0xD3 Setup E820h and WAD memory map LBT Core
0x24 Set segment-register addressability to 4 GB LBT Core
0xCC Redirect Int 10h to enable target board to use a remote serial
video (PICO BIOS).
LBT Core
0x8A Initialize Extended BIOS Data Area and initialize the mouse. LBT Core
0x9D Initialize Security Engine. LBT Core
0x55 USB Initialization LBT Core
0x52 Verify keyboard reset. LBT Core
0x54 Initialize keystroke clicker if enabled in Setup. LBT Core
0x76 Check status bits for keyboard-related failures. Display error
messages on the screen.
LBT Core
0x4A Initialize all video adapters in system LBT Core
0x4C Shadow video BIOS ROM if specified by Setup, and CMOS is
valid and the previous boot was OK.
LBT Core
0x59 Register POST Display Services, fonts, and languages with
the POST Dispatch Manager.
LBT Core
0x57 Initialize 1394 Firewire LBT Core
POST
Code
Function Phase Component