Intel R2000GZ S2600GZ/GL - Page 225
Diagnostic LEDs.
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Intel® Server Board S2600GZ/GL TPS Appendix D: POST Code Diagnostic LED Decoder Table 64. MRC Progress Codes Diagnostic LED Decoder 1 = LED On, 0 = LED Off Upper Nibble Lower Nibble Checkpoint MSB LSB 8h 4h 2h 1h 8h 4h 2h 1h Description LED #7 #6 #5 #4 #3 #2 #1 #0 MRC Progress Codes B0h 1 0 1 1 0 0 0 0 Detect DIMM population B1h 1 0 1 1 0 0 0 1 Set DDR3 frequency B2h 1 0 1 1 0 0 1 0 Gather remaining SPD data B3h 1 0 1 1 0 0 1 1 Program registers on the memory controller level B4h 1 0 1 1 0 1 0 0 Evaluate RAS modes and save rank information B5h 1 0 1 1 0 1 0 1 Program registers on the channel level B6h 1 0 1 1 0 1 1 0 Perform the JEDEC defined initialization sequence B7h 1 0 1 1 0 1 1 1 Train DDR3 ranks B8h 1 0 1 1 1 0 0 0 Initialize CLTT/OLTT B9h 1 0 1 1 1 0 0 1 Hardware memory test and init BAh 1 0 1 1 1 0 1 0 Execute software memory init BBh 1 0 1 1 1 0 1 1 Program memory map and interleaving BCh 1 0 1 1 1 1 0 0 Program RAS configuration BFh 1 0 1 1 1 1 1 1 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. Table 65. MRC Fatal Error Codes Diagnostic LED Decoder 1 = LED On, 0 = LED Off Checkpoint Upper Nibble MSB Lower Nibble LSB Description 8h 4h 2h 1h 8h 4h 2h 1h LED #7 #6 #5 #4 #3 #2 #1 #0 MRC Fatal Error Codes E8h No usable memory error 1 1 1 0 1 0 0 0 01h = No memory was detected from SPD read, or invalid config that causes no operable memory. Revision 2.0 211