Motherboard Manual
50
6.5 BIOS
P
OST
C
ODE
L
IST
CODE
Name
Description
C0 Turn Off Chipset and CPU test Read/Write/Verify all CPU registers
C1 Memory Presence
First block memory detect,presence test
C2 Early Memory Initial
OEM Specific- Board Initialization
C3 Extend Memory DRAM select OEM Specific- Turn on extended memory
C4 Special Display Handling
OEM Specific- Display /Video Switch
C5 Early Shadow
Early shadow enable for fast boot
C6 Cache presence test
External cache size detection
CF CMOS Check
CMOS checkup
B0 Spurious
If interr upt occurs i n pr otected mode
B1 Unclaimed
NMI
If unmasked NMI occurs, display Press F1 to disable NMI, F2
reboot.
BF Program C hip Set
To pr ogram c hipset fr om defaults v alues
E1-EF Setup Pages
E1- Page 1, E2 - Page 2, etc.
1
Build BIOS Engine
Build Award Decompression Bios Engine
2
Setup Bios item
Setup the Bios item segment and Read CMOS data into stack
3
Build PMM Node
Initialize Post Memory Manager
5
Blank video screen
Reset Video controller
7
Initial keyboard
Initialize the keyboar d controller
8
Test Keyboar d
Test the Key board
A
Initial mouse
Initialize the mouse
E
Checksum the BIOS and
message
Check the intergraty of the ROM,BIOS and message
10 Auto detec Flash
Check Flash type and copy flash write/erase routines to
0F000h segments
12 Check CMOS
Check CMOS circuitry
14 Chipset Default l oad
Programs the chipset registers with default v alues
18 Identify the C PU
Check the CPU I D and init Cache controller
1B Setup Interr upt Vector Table
Initialize interrupt vectors table
1C Check CMOS
Check normal CMOS checksum and battery
1D Record MP system
Record MP system
21 initial HPM
If support HPM, HPM get initialized her e
23 Programs chipset
Programs the chipset registers
24 PNP System Resource
PNP System Resource
25 Shadowing system
Shadowing system and video BIOS to speedup booting
26 Initialize Device
program t he Peripher al Device and i nit Generator,Sensor
27
Initial KBC and setup BIOS
data
Final I nitialize the key board controller and set up BIOS area
data
29 Set video i nterface
set VGA to special state Before initial
2B initial Video device
initial Video device
2D Video memory test
Test the vi deo mem ory
2F show message
show Summary message
33 PS2 Mouse setup
Setup PS2 Mouse and reset KB