Intel SR1600UR Service Guide - Page 132

Diagnostic LED Placement Diagram, Table 9. Diagnostic LED POST Code Decoder

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AB C A. System Status LED C. POST Code Diagnostic LEDs B. System Identification LED Figure 89. Diagnostic LED Placement Diagram AF003045 Table 9. Diagnostic LED POST Code Decoder Diagnostic LED Decoder O=On; X=Off Checkpoint Upper Nibble MSB Lower Nibble LSB Description 8h 4h 2h 1h 8h 4h 2h 1h LED #7 #6 #5 #4 #3 #2 #1 #0 Multi-Use Code (This beep code is used in different contexts) 0xF2h O O O O X X OX Memory Error Codes (Accompanied by a beep code) 0xE8h O O O X O XXX OxEAh O O O X O X OX 0xEBh O O O X O X OO Seen at the start of Memory Reference Code (MRC) Start of the very early platform initialization code Very late in POST, it is the signal that the OS has switched to virtual memory mode No Usable Memory Error: No memory in the system, or SPD bad so no memory could be detected Channel Training Error: DQ/DQS training failed on a channel during memory channel initialization. Memory Test Error: memory failed Hardware BIST. 114 Intel® Server System SR1600UR Service Guide

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114
Intel
®
Server System SR1600UR Service Guide
Figure 89. Diagnostic LED Placement Diagram
AF003045
C
B
A
A.
System Status LED
B.
System Identification LED
C.
POST Code Diagnostic LEDs
Table 9. Diagnostic LED POST Code Decoder
Checkpoint
Diagnostic LED Decoder
Description
O=On; X=Off
Upper Nibble
Lower Nibble
MSB
LSB
8h
4h
2h
1h
8h
4h
2h
1h
LED
#7
#6
#5
#4
#3
#2
#1
#0
Multi-Use Code (This beep code is used in different contexts)
0xF2h
O
O
O
O
X
X
O
X
Seen at the start of Memory Reference
Code (MRC)
Start of the very early platform
initialization code
Very late in POST, it is the signal that the
OS has switched to virtual memory
mode
Memory Error Codes (Accompanied by a beep code)
0xE8h
O
O
O
X
O
X
X
X
No Usable Memory Error: No memory in
the system, or SPD bad so no memory
could be detected
OxEAh
O
O
O
X
O
X
O
X
Channel Training Error: DQ/DQS
training failed on a channel during
memory channel initialization.
0xEBh
O
O
O
X
O
X
O
O
Memory Test Error: memory failed
Hardware BIST.