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Appendix F: POST Code Diagnostic LED Decoder
Diagnostic LED Decoder
1 = LED On, 0 = LED Off
Checkpoint
Upper Nibble
MSB
8h
4h
LED #
#7
#6
1
0
99h
1
0
9Ah
1
0
9Bh
1
0
9Ch
1
0
9Dh
1
0
A1h
1
0
A2h
1
0
A3h
1
0
A4h
1
0
A5h
1
0
A6h
1
0
A7h
1
0
A8h
1
0
A9h
1
0
ABh
1
0
ACh
1
0
ADh
1
0
AEh
1
0
AFh
1
0
B0h
1
0
B1h
1
0
B2h
1
0
B3h
1
0
B4h
1
0
B5h
1
0
B6h
1
0
B7h
0
0
00h
S3 Resume
1
1
E0h
1
1
E1h
1
1
E2h
1
1
E3h
BIOS Recovery
1
1
F0h
1
1
F1h
1
1
F2h
1
1
F3h
1
1
F4h
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.
142
Lower Nibble
2h
1h
8h
4h
2h
#5
#4
#3
#2
#1
0
1
1
0
0
0
1
1
0
1
0
1
1
0
1
0
1
1
1
0
0
1
1
1
0
1
0
0
0
0
1
0
0
0
1
1
0
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
0
1
1
1
0
0
1
1
1
0
1
0
0
1
0
1
0
0
1
0
1
0
1
1
0
1
1
0
1
0
1
1
0
1
0
1
1
1
1
0
1
1
1
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
1
1
0
1
0
1
1
0
1
1
1
1
0
1
1
0
0
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
0
0
1
0
1
0
0
1
1
1
0
0
0
1
1
0
0
0
1
1
0
0
1
1
1
0
0
1
1
1
0
1
0
Intel order number G42278-004
LSB
1h
#0
1
DXE SIO Init
0
DXE USB start
1
DXE USB reset
0
DXE USB detect
1
DXE USB enable
1
DXE IDE begin
0
DXE IDE reset
1
DXE IDE detect
0
DXE IDE enable
1
DXE SCSI begin
0
DXE SCSI reset
1
DXE SCSI detect
0
DXE SCSI enable
1
DXE verifying SETUP password
1
DXE SETUP start
0
DXE SETUP input wait
1
DXE Ready to Boot
0
DXE Legacy Boot
1
DXE Exit Boot Services
0
RT Set Virtual Address Map Begin
1
RT Set Virtual Address Map End
0
DXE Legacy Option ROM init
1
DXE Reset system
0
DXE USB Hot plug
1
DXE PCI BUS Hot plug
0
DXE NVRAM cleanup
1
DXE Configuration Reset
0
INT19
0
S3 Resume PEIM (S3 started)
1
S3 Resume PEIM (S3 boot script)
0
S3 Resume PEIM (S3 Video Repost)
1
S3 Resume PEIM (S3 OS wake)
0
PEIM which detected forced Recovery condition
1
PEIM which detected User Recovery condition
0
Recovery PEIM (Recovery started)
1
Recovery PEIM (Capsule found)
0
Recovery PEIM (Capsule loaded)
Intel® Server Board S2600CO Family TPS
Description
Revision 1.4
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