Intel IM-Q35 Series User Manual
Page 67
IM-Q35 Mainboard
4-6
39
Initializes D MAC -1 & DMAC-2.
3A
Initialize RTC date/tim e.
3B
Test for total mem ory installed in the system. Also, Check for DE L or ESC
keys to limit memor y test. Display total memory in the sys tem.
3C
Mid P OS T initialization of chipset registers.
40
D et ect differ ent devices (Parallel ports, serial ports, and coprocessor in
CPU,
… etc.) successfully installed in the sys tem and update the BDA,
EB DA
…etc.
52
Updates C MO S m emory size from memory found in m emory test.
Allocates m emory for Extended BIOS Data Area from base memory.
Pr ogr amming the m emory hole or any kind of implem entation that needs
an adjustment in system RA M size if needed.
60
Initializes NU M-LOCK status and programs the KB D typem atic 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 ES CD in NV Ram.
84
Log errors encountered during POST.
85
Display errors to the us er and gets the user response for error.
87
E xecute B IOS setup if needed / requested. Check boot passw ord if
inst alled.
8C
Late POST initialization of chipset registers.
8D
Build A CPI tables (if ACP I is support ed)
8E
Pr ogr am t he peripheral parameters. E nable/Dis able NMI as s elected
90
Initialization of system m anagement interr upt by invoking all handlers.
P lease 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
R outing T able. Prepares the runtim e language module. Disables the
system configuration display if needed.
A4
Initialize runt ime language module. Display boot option popup m enu.
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 P OST 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. D e- initializes the AD M
m odule.
B1
S ave system context for ACPI. P repare CP U for OS boot including final
MTRR values.
00
P ass es cont rol to OS Loader (typically INT19h).
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