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POST code checkpoints
The following table shows the checkpoints, LED codes, and task description of events that
may occur during the POST portion of the BIOS:
Check
point
Diagnostic LED decoder
G=Green, R=Red, O=Orange
Description
03
Off
Off
G
G
Disable NMI, Parity, video for EGA, and DMA controllers. Initialize
BIOS, POST, Runtime data area. Also initialize BIOS modules
on POST entry and GPNV area. Initialized CMOS as mentioned
in the Kernel Variable “wCMOSFlags.”
04
Off
G
Off
Off
Check CMOS diagnostic byte to determine if battery power is OK
and CMOS checksum is OK. Verify CMOS checksum manually
by reading storage area. If the CMOS checksum is bad, update
CMOS with power-on default values and clear passwords.
Initialize status register A.
Initialize data variables that are based on CMOS setup
questions. Initialize both the 8259 compatible PICs in the system.
05
Off
G
Off
G
Initialize the interrupt controller in hardware (generally PIC) and
interrupt vector table.
06
Off
G
G
Off
Do R/W test to CH-2 count reg. Initialize CH-0 as system timer.
Install the POSTINT1Ch handler. Enable IRQ-0 in PIC for system
timer interrupt.
Trap INT1Ch vector to “POSTINT1ChHandlerBlock.”
08
G
Off
Off
Off
Initialize the CPU. The BAT test is being done on KBC. Program
the keyboard controller command byte is being done after Auto
detection of KB/MS using AMI KB-5.
C0
R
R
Off
Off
Early CPU Init Start — Disable Cache - Init Local APIC
C1
R
R
Off
G
Set up boot strap processor information.
C2
R
R
G
Off
Set up boot strap processor for POST.
C5
R
O
Off
G
Enumerate and set up application processors.
C6
R
O
G
Off
Re-enable cache for boot strap processor.
C7
R
O
G
G
Early CPU Init Exit.
0A
G
Off
G
Off
Initialize the 8042 compatible keyboard controller.
0B
G
Off
G
G
Detect the presence of PS/2 mouse.
0C
G
G
Off
Off
Detect the presence of keyboard in KBC port.
Summary of Contents for 9515
Page 1: ...User Guide Gateway 9515 Server ...
Page 15: ...10 www gateway com ...
Page 125: ...120 www gateway com ...
Page 151: ...146 www gateway com ...
Page 177: ...172 www gateway com ...
Page 193: ...188 www gateway com ...
Page 194: ...A MAN 9515 USR GDE R0 12 04 ...