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The eight diagnostic LEDs are divided into two groups. LEDs from
CR15 |
| CR14 |
| CR13 |
| CR12 |
| CR11 |
| CR10 |
| CR9 |
| CR8 |
In determining the code, Off = 0 and On = 1. Based on this, you can determine the corresponding hex code. Then, by checking “POST code checkpoints” on page 73, “Bootblock initialization code checkpoints” on page 76, “Bootblock recovery code checkpoints” on page 76, “DIM code checkpoints” on page 77, and “ACPI runtime checkpoints” on page 78, you can find out where an error is taking place.
For example, if a hex code of 0B is indicated, you can detemine that the server cannot detect the PS/2 mouse. You can then take measures, such as reinserting the mouse, to solve the problem.
All LEDs are cleared and restored to normal status after the server is power cycled.
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
03Disable 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.”
04Check 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
Initialize data variables that are based on CMOS setup questions. Initialize both the 8259 compatible PICs in the system.
05Initialize the interrupt controller in hardware (generally PIC) and interrupt vector table.
73