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Appendix D: POST Code Diagnostic LED Decoder
Diagnostic LED Decoder
1 = LED On, 0 = LED Off
Upper Nibble
Checkpoint
MSB
8h
4h 2h 1h 8h 4h 2h
LED #
#7
#6 #5 #4 #3 #2 #1
62h
0
1
1
63h
0
1
1
68h
0
1
1
69h
0
1
1
6Ah
0
1
1
70h
0
1
1
71h
0
1
1
72h
0
1
1
78h
0
1
1
79h
0
1
1
90h
1
0
0
91h
1
0
0
92h
1
0
0
93h
1
0
0
94h
1
0
0
95h
1
0
0
96h
1
0
0
97h
1
0
0
98h
1
0
0
99h
1
0
0
9Ah
1
0
0
9Bh
1
0
0
9Ch
1
0
0
9Dh
1
0
0
A1h
1
0
1
A2h
1
0
1
A3h
1
0
1
A4h
1
0
1
A5h
1
0
1
A6h
1
0
1
A7h
1
0
1
A8h
1
0
1
A9h
1
0
1
ABh
1
0
1
ACh
1
0
1
ADh
1
0
1
AEh
1
0
1
AFh
1
0
1
B0h
1
0
1
B1h
1
0
1
158
1.1
Lower Nibble
LSB
1h
#0
0
0
0
1
0 SB RUN Init
0
0
0
1
1 Dxe CPU Init
0
1
0
0
0 DXE PCI Host Bridge Init
0
1
0
0
1 DXE NB Init
0
1
0
1
0 DXE NB SMM Init
1
0
0
0
0 DXE SB Init
1
0
0
0
1 DXE SB SMM Init
1
0
0
1
0 DXE SB devices Init
1
1
0
0
0 DXE ACPI Init
1
1
0
0
1 DXE CSM Init
1
0
0
0
0 DXE BDS Started
1
0
0
0
1 DXE BDS connect drivers
1
0
0
1
0 DXE PCI Bus begin
1
0
0
1
1 DXE PCI Bus HPC Init
1
0
1
0
0 DXE PCI Bus enumeration
1
0
1
0
1 DXE PCI Bus resource requested
1
0
1
1
0 DXE PCI Bus assign resource
1
0
1
1
1 DXE CON_OUT connect
1
1
0
0
0 DXE CON_IN connect
1
1
0
0
1 DXE SIO Init
1
1
0
1
0 DXE USB start
1
1
0
1
1 DXE USB reset
1
1
1
0
0 DXE USB detect
1
1
1
0
1 DXE USB enable
0
0
0
0
1 DXE IDE begin
0
0
0
1
0 DXE IDE reset
0
0
0
1
1 DXE IDE detect
0
0
1
0
0 DXE IDE enable
0
0
1
0
1 DXE SCSI begin
0
0
1
1
0 DXE SCSI reset
0
0
1
1
1 DXE SCSI detect
0
1
0
0
0 DXE SCSI enable
0
1
0
0
1 DXE verifying SETUP password
0
1
0
1
1 DXE SETUP start
0
1
1
0
0 DXE SETUP input wait
0
1
1
0
1 DXE Ready to Boot
0
1
1
1
0 DXE Legacy Boot
0
1
1
1
1 DXE Exit Boot Services
1
0
0
0
0 RT Set Virtual Address Map Begin
1
0
0
0
1 RT Set Virtual Address Map End
Intel order number G34153-003
Intel® Server Board S2600IP and Intel® Workstation Board W
Description
Revision
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