135 Revision 1.3
Relion 1900e/2900e Manual
In the following example, the BIOS sends a value of ACh to the diagnostic LED decoder. The LEDs are
decoded as follows:
Note: Diag LE
Ds are best read and decoded when viewing the LEDs from the back of the system
Table 60. POST Progress Code LED Example
LEDs
Results
Upper
nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated as ACh
Early P
OST 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.
Table 61. MRC Progress Codes
Checkpoint
Description
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
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