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152 Chapter 4
0x1A Initialize DMA command register with these settings:
1. Memory to memory disabled 2. Channel 0 hold
address disabled 3. Controller enabled 4. Normal
timing 5. Fixed priority 6. Late write selection 7.
DREQ sense active 8. DACK sense active low.
LBT Core
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
POST Code Function Phase Component