Appendix C: LED Decoder
66
Intel
®
Server System H2000JF Family Service Guide
Checkpoint
Diagnostic LED Decoder
Description
1 = On, 0=Off
Upper Nibble
Lower Nibble
MSB
LSB
8h
4h
2h
1h
8h
4h
2h
1h
LED
#7
#6
#5
#4
#3
#2
#1
#0
0xEBh
1
1
1
0
1
0
1
1
Memory test failed (system halted)
0xECh
1
1
1
0
1
1
0
0
Unsupported or invalid DIMM configuration (system halted)
0xEDh
1
1
1
0
1
1
0
1
Unsupported or invalid DIMM configuration (system halted)
0xEBh
1
1
1
0
1
0
1
1
DIMM with corrupted SPD data detected (system halted)
QuickPath Interconnect (QPI)
0xA0h
1
0
1
0
0
0
0
0
QPI Initialization
0xA1h
1
0
1
0
0
0
0
1
QPI Initialization
0xA2h
1
0
1
0
0
0
1
0
QPI Initialization
0xA3h
1
0
1
0
0
0
1
1
QPI Initialization
0xA4h
1
0
1
0
0
1
0
0
QPI Initialization
0xA5h
1
0
1
0
0
1
0
1
QPI Initialization
0xA6h
1
0
1
0
0
1
1
0
QPI Initialization
0xA7h
1
0
1
0
0
1
1
1
QPI Initialization
0xA8h
1
0
1
0
1
0
0
0
QPI Initialization
0xA9h
1
0
1
0
1
0
0
1
QPI Initialization
0xAAh
1
0
1
0
1
0
1
0
QPI Initialization
0xABh
1
0
1
0
1
0
1
1
QPI Initialization
0xACh
1
0
1
0
1
1
0
0
QPI Initialization
0xADh
1
0
1
0
1
1
0
1
QPI Initialization
0xAEh
1
0
1
0
1
1
1
0
QPI Initialization
0xAFh
1
0
1
0
1
1
1
1
QPI Initialization
Integrated Memory Controller (IMC)
0xB0h
1
0
1
1
0
0
0
0
Memory Initialization of Integrated Memory Controller
0xB1h
1
0
1
1
0
0
0
1
Memory Initialization of Integrated Memory Controller
0xB2h
1
0
1
1
0
0
1
0
Memory Initialization of Integrated Memory Controller
0xB3h
1
0
1
1
0
0
1
1
Memory Initialization of Integrated Memory Controller
0xB4h
1
0
1
1
0
1
0
0
Memory Initialization of Integrated Memory Controller
0xB5h
1
0
1
1
0
1
0
1
Memory Initialization of Integrated Memory Controller
0xB6h
1
0
1
1
0
1
1
0
Memory Initialization of Integrated Memory Controller
0xB7h
1
0
1
1
0
1
1
1
Memory Initialization of Integrated Memory Controller
0xB8h
1
0
1
1
1
0
0
0
Memory Initialization of Integrated Memory Controller
0xB9h
1
0
1
1
1
0
0
1
Memory Initialization of Integrated Memory Controller
0xBAh
1
0
1
1
1
0
1
0
Memory Initialization of Integrated Memory Controller
0xBBh
1
0
1
1
1
0
1
1
Memory Initialization of Integrated Memory Controller
0xBCh
1
0
1
1
1
1
0
0
Memory Initialization of Integrated Memory Controller
0xBDh
1
0
1
1
1
1
0
1
Memory Initialization of Integrated Memory Controller
0xBEh
1
0
1
1
1
1
1
0
Memory Initialization of Integrated Memory Controller
0xBFh
1
0
1
1
1
1
1
1
Memory Initialization of Integrated Memory Controller
PCI Bus
0x50h
0
1
0
1
0
0
0
0
Enumerating PCI buses