Aspire Digital MB.ASR06.001 0x22 Reset the keyboard, 0x40 Test A20 line, 0x55 USB Initialization

POST	Function	Phase	Component
Code
0x22	Reset the keyboard.	LBT	Core
0x40	Test A20 line	LBT	Core
0x67	Quick initialization of all Application Processors in a multi-	LBT	Core
	processor system
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	LBT	Core
	successful, reboot.
0x3C	If CMOS is valid, load chipset registers with values from	LBT	Core
	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).
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.	LBT	Core

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

0xC6	Initialize note dock	LBT	Core
0xC5	PnPnd dual CMOS (optional)	LBT	Core
0x48	Verify that the equipment specified in the CMOS matches the	LBT	Core
	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
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	LBT	Core
	video (PICO BIOS).
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	LBT	Core
	messages on the screen.
0x4A	Initialize all video adapters in system	LBT	Core
0x4C	Shadow video BIOS ROM if specified by Setup, and CMOS is	LBT	Core
	valid and the previous boot was OK.
0x59	Register POST Display Services, fonts, and languages with	LBT	Core
	the POST Dispatch Manager.
0x57	Initialize 1394 Firewire	LBT	Core

142 Chapter 4