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Code(hex)
Name
66
Early System setup
67
KBC and CMOS Init
68
Video Init
69
8259 Init
6A
Memory test
6B
CPU Detect and IO
init
6C
Reserved
6D
Reserved
6E
Reserved
6F
Reserved
70
Setup Init
71
Setup Cache
Controller
72
Install FDD
73
Install HDD
74
Detect &
Initialize Math
Coprocessor
75
HDD Check for
Write protection
76
Reserved
Description
Check the CPU ID and init L1/L2 cache
Initialize first 120 interrupt
vectors with SPURIOUS_INT_HDLR and
initialize INT 00h-1Fh according to
INT_TBL First step initialize if single
CPU onboard. Re-init KB
If support HPM, HPM get initialized
here
Verifies CMOS is working correctly,
detects bad battery. If failed, load
CMOS defaults and load into chipset
Final Initial KBC and setup BIOS data
area.
Read CMOS location 14h to find out
type of video in use.
Detect and Initialize Video Adapter.
Test video memory, write sign-on
message to screen.
Setup shadow RAM - Enable shadow
according to Setup.
Init 8259 channel 1 and mask IRQ 9
Quick Memory Test
Detect CPU speed and display
CPU vendor specific version string
and turn on all necessary CPU features
Display PnP logo and PnP early init
Setup virus protect according to
Setup. If required, will auto load
Awdflash.exe in POST
Initializing onboard superIO
Display setup message and enable setup
functions Detect if mouse is present,
initialize mouse, install interrupt
vectors. Special treatment to PS2
Mouse port
ACPI sub-system initializing
Initialize cache controller.
Enter setup check and auto-
configuration check up
Initialize floppy disk drive
controller and any drives.
Install FDD and setup BIOS data area
parameters
Initialize hard drive controller and
any drives.
IDE device detection and install
Initialize any serial and parallel
ports (also game port).
Initialize math coprocessor.
HDD check out
i6
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