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Appendix B: LED Decoder
Upper Nibble
Checkpoint
MSB
8h
4h
LED
MRC Progress Codes
B0h
1
0
B1h
1
0
B2h
1
0
B3h
1
0
B4h
1
0
B5h
1
0
B6h
1
0
B7h
1
0
B8h
1
0
B9h
1
0
BAh
1
0
BBh
1
0
BCh
1
0
BFh
1
0
Memory Initialization at the beginning of POST includes multiple functions, including: discovery,
channel training, validation that the DIMM population is acceptable and functional, initialization of
the IMC and other hardware settings, and initialization of applicable RAS configurations.
When a major memory initialization error occurs and prevents the system from booting with data
integrity, a beep code is generated, the MRC will display a fatal error code on the diagnostic LEDs,
and a system halt command is executed. Fatal MRC error halts do NOT change the state of the
System Status LED, and they do NOT get logged as SEL events. The following table lists all MRC
fatal errors that are displayed to the Diagnostic LEDs.
Upper Nibble
Checkpoint
MSB
8h
LED
MRC Fatal Error Codes
E8h
E9h
1
EAh
1
EBh
1
98
Table 9. MRC Progress Codes
Diagnostic LED Decoder
1 = LED On, 0 = LED Off
Lower Nibble
2h
1h
8h
4h
2h
#
#
#
#
7
6
5
4
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
1
1
0
1
0
1
1
0
1
1
1
1
0
1
1
1
1
1
0
0
1
1
1
0
0
1
1
1
0
1
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
Table 10. MRC Fatal Error Codes
Diagnostic LED Decoder
1 = LED On, 0 = LED Off
Lower Nibble
4h
2h
1h
8h
4h
#
#
#
#
#
7
6
5
4
3
1
1
1
0
1
1
1
0
1
1
1
0
1
0
1
1
0
1
0
LSB
1h
#
#
#
#
3
2
1
0
0
Detect DIMM population
1
Set DDR3 frequency
0
Gather remaining SPD data
1
Program registers on the memory controller level
0
Evaluate RAS modes and save rank information
1
Program registers on the channel level
0
Perform the JEDEC defined initialization sequence
1
Train DDR3 ranks
0
Initialize CLTT/OLTT
1
Hardware memory test and init
0
Execute software memory init
1
Program memory map and interleaving
0
Program RAS configuration
1
MRC is done
LSB
2h
1h
#
#
#
2
1
0
No usable memory error
0
0
0
Memory is locked by Intel
0
0
1
Technology and is inaccessible
DDR3 channel training error
1
0
Memory test failure
1
1
®
Intel
Compute Module MFS2600KI User Guide
Description
Description
®
Trusted Execuiton
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