Intel SR2600UR - Server System - 0 MB RAM, Service Manual

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158 Intel
®
Server System SR2600UR/SR2625UR Service Guide
Figure 134. Diagnostic LED Placement Diagram
AF003045
C B A
A. System Status LED B. System Identification LED
C. POST Code Diagnostic LEDs
Table 8. 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.