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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
2h
LED #
#7
#6
#5
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.
144
Lower Nibble
LSB
1h
8h
4h
2h
1h
#4
#3
#2
#1
#0
0
1
1
0
0
1
0
1
1
0
1
0
0
1
1
0
1
1
0
1
1
1
0
0
0
1
1
1
0
1
1
0
0
0
0
1
1
0
0
0
1
0
1
0
0
0
1
1
1
0
0
1
0
0
1
0
0
1
0
1
1
0
0
1
1
0
1
0
0
1
1
1
1
0
1
0
0
0
1
0
1
0
0
1
1
0
1
0
1
1
1
0
1
1
0
0
1
0
1
1
0
1
1
0
1
1
1
0
1
0
1
1
1
1
1
1
0
0
0
0
1
1
0
0
0
1
1
1
0
0
1
0
1
1
0
0
1
1
1
1
0
1
0
0
1
1
0
1
0
1
1
1
0
1
1
0
1
1
0
1
1
1
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
1
0
0
1
0
0
1
0
0
1
1
1
1
0
0
0
0
1
1
0
0
0
1
1
1
0
0
1
0
1
1
0
0
1
1
1
1
0
1
0
0
Intel order number G42278-002
Intel® Server Board S2600CO Family TPS
DXE SIO Init
DXE USB start
DXE USB reset
DXE USB detect
DXE USB enable
DXE IDE begin
DXE IDE reset
DXE IDE detect
DXE IDE enable
DXE SCSI begin
DXE SCSI reset
DXE SCSI detect
DXE SCSI enable
DXE verifying SETUP password
DXE SETUP start
DXE SETUP input wait
DXE Ready to Boot
DXE Legacy Boot
DXE Exit Boot Services
RT Set Virtual Address Map Begin
RT Set Virtual Address Map End
DXE Legacy Option ROM init
DXE Reset system
DXE USB Hot plug
DXE PCI BUS Hot plug
DXE NVRAM cleanup
DXE Configuration Reset
INT19
S3 Resume PEIM (S3 started)
S3 Resume PEIM (S3 boot script)
S3 Resume PEIM (S3 Video Repost)
S3 Resume PEIM (S3 OS wake)
PEIM which detected forced Recovery condition
PEIM which detected User Recovery condition
Recovery PEIM (Recovery started)
Recovery PEIM (Capsule found)
Recovery PEIM (Capsule loaded)
Description
Revision 1.0
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