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BIOS Setup Information
Uncompressed Initialization Codes
The following runtime checkpoint hex codes are listed in order of execution. These codes are
uncompressed in F0000h shadow RAM.
Table 4-12.Uncompressed Initialization Codes
Code
Description
03
The NMI is disabled. Checking for a soft reset or a power on condition.
05
The BIOS stack has been built. Disabling cache memory.
06
Uncompressing the POST code.
07
Initializing the CPU and the CPU data area.
08
The CMOS checksum calculation.
0B
Performing any required initialization before the keyboard BAT
command is issued.
0C
The keyboard controller input buffer is free. Issuing the BAT
command to the keyboard controller.
0E
The keyboard controller BAT command result has been verified.
Performing any necessary INIT after the K/B controller BATcommand
test.
0F
The keyboard command byte is written.
10
Issuing pins 23 and 24 for blocking and unblocking commands.
11
Checking if the [End] or [Ins] keys were pressed during power on.
12
To initialize CMOS if the
initialize CMOS RAM in every boot
is set or the
[End] key is pressed. Disabling DMA and Interrupt controllers.
13
The video display has been disabled. Port B has been initialized.
Initializing the chipset.
14
The 8254 timer test.
19
The 8254 timer test is over. Starting the memory refresh test.
