52 Intel® Server Board S3420GP User Guide
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• Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
Table 6. POST Progress Code LED Example
LEDs Upper Nibble LEDs
Lower Nibble LEDs
LEDs
MSB
LED #7 LED #6 LED #5 LED #4 LED #3 LED #2 LED #1 LED #0
8h 4h 2h 1h 8h 4h 2h 1h
Status
ON OFF ON OFF ON ON OFF OFF
Results
10 1011 0 0
Ah Ch
Table 7. Diagnostic LED POST Code Decoder
Diagnostic LED Decoder
Checkpoint O = On, X = Off Description
Upper Nibble Lower Nibble
MSB LSB
8h 4h 2h 1h 8h 4h 2h 1h
LED #7 #6#5 #4 #3#2#1#0
Host Processor
0x10h X XXO XXXXPower-on initialization of
the host processor
(bootstrap processor)
0x11h X XXO XXXOHost processor cache
initialization (including AP)
0x12h X X X O X X O X Starting application
processor initialization
0x13h X X X O X X O O SMM initialization
Chipset
0x21h X XOX XXXOInitializing a chipset
component
Memory
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