Intel® Server System M20MYP1UR System Integration and Service Guide
76
Should a major memory initialization error occur, preventing the system from booting with data integrity, a
beep code is generated, the MRC displays 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. Table 5 lists all MRC fatal errors that are displayed to the diagnostic LEDs.
Note
: Fatal MRC errors 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 three short beeps as identified in Table 8.
Table 5. MRC Fatal Error codes
Post Code
(Hex)
Nibble
8h
(MSB)
4h
2h
1h
(LSB)
Description
E8
Upper
1
1
1
0
No Usable Memory Error:
01h = No memory was detected via SPD read, or invalid config
that causes no operable memory.
02h = Memory DIMMs on all channels of all sockets are
disabled due to hardware memtest error.
03h = No memory installed. All channels are disabled.
Lower
1
0
0
0
E9
Upper
1
1
1
0
Memory is locked by Intel® TXT and is inaccessible
Lower
1
0
0
1
EA
Upper
1
1
1
0
DDR4 channel training error
01h = Error on read DQ/DQS (Data/Data Strobe) initialization
02h = Error on receive enable
03h = Error on write leveling
04h = Error on write DQ/DQS (Data/Data Strobe)
Lower
1
0
1
0
EB
Upper
1
1
1
0
Memory test failure
01h = Software mem-test failure.
02h = Hardware mem-test failed.
Lower
1
0
1
1
ED
Upper
1
1
1
0
DIMM configuration population error
01h = Different DIMM types (UDIMM, RDIMM, LRDIMM) are
installed in the system.
02h = Violation of DIMM population rules.
03h = The third DIMM slot cannot be populated when QR
DIMMs are installed.
04h = UDIMMs are not supported in the third DIMM slot.
05h = Unsupported DIMM voltage.
Lower
1
1
0
1
EF
Upper
1
1
1
0
Indicates a CLTT table structure error
Lower
1
1
1
1
