Diagnostic Leds - Gateway E-9425R User Manual

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Diagnostic LEDs

The BIOS sends a 1-byte hex code to port 80 prior to each POST task. These
codes are displayed on eight orange LEDs, located on the system board and
available at the back of the server chassis. They can provide troubleshooting
information in the event of a system hang during POST.
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 Description
point
03 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 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 Initialize the interrupt controller in hardware (generally PIC) and interrupt
vector table.
06 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 Initialize the CPU. The BAT test is being done on KBC. The keyboard
controller command byte is being programmed after Auto detection of
KB/MS using AMI KB-5.
C0 Early CPU Init Start — Disable Cache - Init Local APIC
C1 Set up boot strap processor information.
C2 Set up boot strap processor for POST.
C5 Enumerate and set up application processors.
C6 Re-enable cache for boot strap processor.
C7 Early CPU Init Exit.
0A Initialize the 8042 compatible keyboard controller.
0B Detect the presence of PS/2 mouse.
0C Detect the presence of keyboard in KBC port.
0E Testing and initialization of different input devices. Also, update the
Kernel Variables.
Trap the INT09h vector, so that the POST INT09h handler gets control for
IRQ1. Uncompress all available language, BIOS logo, and Silent logo
modules.
Troubleshooting
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