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Intel® Server System S9200WK Product Family Setup and Service Guide
Early POST Memory Initialization MRC Diagnostic Codes
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.
The MRC Progress Codes are displayed to the Diagnostic LEDs that show the execution point in the MRC
operational path at each step.
Diagnostic LED Decoder
1 = LED On, 0 = LED Off
Upper Nibble
Checkpoint
(Amber)
MSB
8h
4h
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
Should a major memory initialization error occur, preventing the system from booting with data integrity, 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 charge 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.
Table 3. MRC progress codes
Lower Nibble
(Green)
LSB
2h
1h
8h
4h
2h
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
Description
1h
0
Detect DIMM population
1
Set DDR4 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 DDR4 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
85
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