T
ROUBLESHOOTING
T
ROUBLESHOOTING
6-1
6.1 Troubleshooting
This section provides information for the monitoring and identification of system faults.
BIOS checkpoints
Verify the BIOS spec. Section 12.3 as Standard checkpoint. Compare the output value of
the debug card to checkpoint index table.
Intel Memory Reference Code Checkpoints
The BIOS will show MRC error/warning codes on the 80port LED when MRC errors happen.
The LED flash sequence will be (with 1 second interval): For no specific DIMM location
errors (ex. no memory detected): Major error code -> Minor error code -> 0 ->... (repeat)
For specific DIMM location errors (ex. wrong DIMM population): Major error code -> Minor
error code -> DIMM location -> 0 ->... (repeat)
Table 1: BIOS Checkpoints
S
TATUS
C
ODE
R
ANGE
D
ESCRIPTION
0x01 - 0x0B
SEC execution
0x0C - 0x0F
SEC errors
0x10 - 0x2F
PEI execution up to and including memory detection
0x30 - 0x4F
PEI execution after memory detection
0x50 - 0x5F
PEI errors
0x60 - 0x8F
DXE execution up to BDS
0x90 - 0xCF
BDS execution
0xD0 - 0xDF
DXE errors
0xE0 - 0xE8
S3 Resume (PEI)
0xE9 - 0xEF
S3 Resume errors (PEI)
0xF0 - 0xF8
Recovery (PEI)
0xF9 - 0xFF
Recovery errors (PEI)
Table 2: Memory Reference Code Checkpoints
N
ODE
C
HANNEL
DIMM
E
RROR
C
ODE
0
1
0
0xA0
0
1
1
0xA1
0
2
0
0xA2
0
2
1
0xA3
0
3
0
0xA4
0
3
1
0xA5
