Intel SX220 - Manual (Page 131)

Viglen SX220 User Guide 130
nibble is represented by a red LED and each bit in the lower nibble is represented by
a green LED. If both bits are set in the upper and lower nibble then both red and
green LEDs are lit, resulting in an amber colour. Likewise, if both bits are clear then
the red and green LEDs are off.
During the POST process, each light sequence represents a specific Port-80 POST
code. If a system should hang during POST, the Diagnostic LEDs will present the
last test executed before the hang. When reading the lights, the LEDs should be
observed from the back of the system. The most significant bit (MSB) is the first
LED on the left, and the least significant bit (LSB) is the last LED on the right.
NOTE: When comparing a diagnostic LED colour string from the baseboard to those
listed in the diagnostic LED decoder in the following tables, the LEDs on the
baseboard should be referenced when viewed by looking into the system
from the back. Reading the LEDs from left to right, the Hi bit is located on
the left.
Table 41 : POST Codes
Diagnostic LED Decoder
G=Green, R=Red, A=Amber
Post
Code
MSB LSB
Description
07h Off G G G Uncompress various BIOS Modules
08h G Off Off Off Verify password Checksum
08h G Off Off Off Verify CMOS Checksum.
07h Off G G G Read Microcode updates from BIOS ROM.
07h Off G G G
Initialising the processors. Set up processor registers. Select least featured
processor as the BSP.
0Bh G Off G G Hook before the keyboard BAT command is issued.
0Ch G G Off Off
Keyboard Controller Test: The keyboard controller input buffer is free. Next,
issuing the BAT command to the keyboard controller
0Eh G G G Off
Init after Keyboard Test: The keyboard controller BAT command result has
been verified. Next, performing any necessary initialisation after the
keyboard controller BAT command test.
0Fh G G G G
Write Command Byte 8042: The initialisation after the keyboard controller
BAT command test is done. The keyboard command byte will be written
next.
10h Off Off Off R
Keyboard Init: The keyboard controller command byte is written. Next,
issuing the pin 23 and 24 blocking and unblocking commands
10h Off Off Off R Disable and initialise 8259
11h Off Off Off A Detect Configuration Mode, such as CMOS clear.
13h Off Off G A Chipset Initialisation before CMOS initialisation
Continued