Intel IM-Q35 Series manual Initializes Dmac -1 & DMAC-2

IM-Q35 Mainboard

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 memor y test. Display total memory in the sys tem.
3C	Mid POST initialization of chipset registers.
40	Det ect differ ent devices (Parallel ports, serial ports, and coprocessor in
	CPU, … etc.) successfully installed in the sys tem and update the BDA,
	EBDA…etc.
52	Updates CMOS memory size from memory found in memory test.
	Allocates memory for Extended BIOS Data Area from base memory.
	Pr ogr amming the memory hole or any kind of implementation that needs
	an adjustment in system RAM size if needed.
60	Initializes NUM-LOCK status and programs the KBD typematic r ate.
75	Initialize Int-13 and prepare for IPL detection.
78	Initializes IPL devices controlled by BIOS and option ROMs.
7C	Generat e and write contents of ESCD in NVRam.
84	Log errors encountered during POST.
85	Display errors to the us er and gets the user response for error.
87	Execute BIOS setup if needed / requested. Check boot password if
	inst alled.
8C	Late POST initialization of chipset registers.
8D	Build ACPI tables (if ACPI is support ed)
8E	Pr ogr am t he peripheral parameters. Enable/Dis able NMI as s elected
90	Initialization of system management interr upt by invoking all handlers.
	Please note this checkpoint comes r ight after checkpoint 20h
A1	Clean-up work needed before booting to OS.
A2	Takes care of r untime image preparation for different BIOS modules. Fill
	the free area in F000h segment with 0FFh. Initializes the Microsoft IRQ
	Routing Table. Prepares the runtime language module. Disables the
	system configuration display if needed.
A4	Initialize runt ime language module. Display boot option popup menu.
A7	Displays the system c onfiguration screen if enabled. Initialize the CPU’s
	before boot, which includes the programming of the MTRR’s.
A9	W ait for user input at c onfig display if needed.
AA	Uninstall POST INT 1Ch vector and INT09h vec tor.
AB	Pr epare BBS for Int 19 boot. Init MP tables.
AC	End of POST initialization of chipset regist ers. De- initializes the ADM
	module.
B1	Save system context for ACPI. Prepare CPU for OS boot including final
	MTRR values.
00	Pass es cont rol to OS Loader (typically INT19h).

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