Intel R2000GZ R1000GZ and R1000GL - Page 65

Intel® Server System R1000GZ/GL Product Family TPS 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 29. MRC Progress Codes Diagnostic LED Decoder 1 = LED On, 0 = LED Off Checkpoint Upper Nibble Lower Nibble MSB LSB 8h 4h 2h 1h 8h 4h 2h 1h LED #7 #6 #5 #4 #3 #2 #1 #0 MRC Progress Codes B0h 1 011000 0 B1h 1 011000 1 B2h 1 011001 0 B3h 1 011001 1 B4h 1 011010 0 B5h 1 011010 1 B6h 1 011011 0 B7h 1 011011 1 B8h 1 011100 0 B9h 1 011100 1 BAh 1 011101 0 BBh 1 011101 1 BCh 1 011110 0 BFh 1 011111 1 Description Detect DIMM population Set DDR3 frequency 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 Train DDR3 ranks Initialize CLTT/OLTT Hardware memory test and init Execute software memory init Program memory map and interleaving Program RAS configuration MRC is done 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. Revision 2.0 55