RM23712 TPS
84
Note: Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated
as ACh
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 displays to the Diagnostic LEDs that show the execution point in
the MRC operational path at each step.
Table 55.MRC Progress Codes
Should a major memory initialization error occur, preventing 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.
NOTE: Fatal MRC errors will display POST error codes that may be the same as BIOS POST progress
codes displayed later in the POST process. The fatal MRC codes can be distinguished from the BIOS
POST progress codes by the accompanying memory failure beep code of 3 long beeps as identified in
Table 57.
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