Intel SR1695GPRX1AC ユーザーズマニュアル
Intel® Server System SR1695GPRX TPS
Appendix B: POST Code LED Decoder
Revision 1.5
61
Intel order number: G11332-006
Appendix B: POST Code 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.
Figure 30. Diagnostic LED location
Table 61. POST Code Diagnostic LED Location
A
ID LED
B
Status LED
C
Diagnostic LED #7 MSB
G
Diagnostic LED #3
D
Diagnostic LED #6
H
Diagnostic LED #2
E
Diagnostic LED #5
I
Diagnostic LED #1
F
Diagnostic LED #4
J
Diagnostic LED #0 LSB
Each POST code is represented by the eight amber diagnostic LEDs. The POST codes are
divided into two nibbles, an upper nibble and a lower nibble. The upper nibble bits are
represented by diagnostic LEDs #4, #5, #6, and #7. The lower nibble bits are represented by
diagnostics LEDs #0, #1, #2, and #3. If the bit is set in the upper and lower nibbles, then the
corresponding LED is lit. If the bit is clear, then the corresponding LED is off.
divided into two nibbles, an upper nibble and a lower nibble. The upper nibble bits are
represented by diagnostic LEDs #4, #5, #6, and #7. The lower nibble bits are represented by
diagnostics LEDs #0, #1, #2, and #3. If the bit is set in the upper and lower nibbles, then the
corresponding LED is lit. If the bit is clear, then the corresponding LED is off.
The diagnostic LED #7 is labeled as “MSB” (Most Significant Bit), and the diagnostic LED #0 is
labeled as “LSB” (Least Significant Bit).
labeled as “LSB” (Least Significant Bit).
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: