Appendix C: POST Code Diagnostic LED Decoder IntelĀ® Server Board S2400SC TPS
Intel order number G36516-002 Revision 2.0
POST Memory Initialization MRC Diagnostic Codes
There are two types of POST Diagnostic Codes displayed by the MRC during memory
initialization; Progress Codes and Fatal Error Codes.
The MRC Progress Codes are displays to the Diagnostic LEDs that show the execution point in
the MRC operational path at each step.
Table 52. MRC Progress Codes
Gather remaining SPD data
Program registers on the memory controller level
Evaluate RAS modes and save rank information
Program registers on the channel level
Perform the JEDEC defined initialization sequence
Hardware memory test and init
Execute software memory init
Program memory map and interleaving
Program RAS configuration
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.
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