Intel R1304BTSSFAN ユーザーズマニュアル
Appendix C: POST Code Diagnostic LED Decoder
Intel
®
Server System R1304BTSSFAN/R1304BTLSFAN/R1304BTLSHBN TPS
Revision 2.0
51
Intel order number G17455-004
Appendix C: POST Code Diagnostic LED Decoder
During the system boot process, the BIOS executes a number of platform configuration
processes, each of which is assigned a specific hex POST code number. As each configuration
routine is started, the BIOS displays the POST code to the POST Code Diagnostic LEDs on the
back edge of the server board. To assist in troubleshooting a system hang during the POST
process, you can use the diagnostic LEDs to identify the last POST process executed.
processes, each of which is assigned a specific hex POST code number. As each configuration
routine is started, the BIOS displays the POST code to the POST Code Diagnostic LEDs on the
back edge of the server board. To assist in troubleshooting a system hang during the POST
process, you can use the diagnostic LEDs to identify the last POST process executed.
Later in POST, the BIOS displays POST Error Codes on the video monitor in the Error Manager
display. Any POST Error Codes are automatically logged in the event log.
display. Any POST Error Codes are automatically logged in the event log.
The Diagnostic LEDs are a set of LEDs found on the back edge of the server board. The exact
implementation may differ for some boards, but in general there are 8 Diagnostic LEDs which
form a 2 hex digit (8 bit) code read left-to-right as facing the rear of the server.
implementation may differ for some boards, but in general there are 8 Diagnostic LEDs which
form a 2 hex digit (8 bit) code read left-to-right as facing the rear of the server.
An LED which is ON represents a 1 bit value, and an LED which is OFF represents a 0 bit value.
The LED bit values are read as Most Significant Bit to the left, Least Significant Bit to the right.
The LED bit values are read as Most Significant Bit to the left, Least Significant Bit to the right.
In the following example, the BIOS sends a value of ACh to the diagnostic LED decoder. The
LEDs are decoded as follows:
LEDs are decoded as follows:
Table 32. POST Progress Code LED Example
LEDs
Upper Nibble LEDs
Lower Nibble LEDs
MSB
LSB
LED #7
LED #6
LED #5
LED #4
LED #3
LED #2
LED #1
LED #0
8h 4h 2h 1h 8h 4h 2h 1h
Status
ON
OFF ON OFF ON OFF ON OFF
Results 1 0 1 0 1 1 0 0
Ah Ch
Note:
Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated as ACh.
Table 33. POST Progress Codes
Progress Code
Diagnostic LED Decoder
O = On, X=Off
Upper Nibble Lower Nibble
MSB 8h 4h 2h 1h 8h 4h 2h 1h LSB
#7 #6 #5 #4 #3 #2 #1 #0
Description
SEC Phase
0x01
X X X X X X X O
First POST code after CPU reset
0x02
X X X X X X O X
CPU Microcode load begin
0x03
X X X X X X O O
Cache As RAM initialization begin
0x05
X X X X X O X O
SEC Core at Power On Begin.
0x06
X X X X X O O X
Early CPU initialization during Sec
Phase
Phase