Table 6. Post Progress Code Led Example; Table 7. Diagnostic Led Post Code Decoder - Intel S3420GP Manual

.
LEDs
MSB
LEDs
LED #7
8h
Status
ON
1
Results
•
Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
Checkpoint
MSB
8h
LED #7
Host Processor
0x10h X
0x11h X
0x12h X
0x13h X
Chipset
0x21h X
Memory
52

Table 6. POST Progress Code LED Example

Upper Nibble LEDs
LED #6 LED #5 LED #4
4h 2h 1h
OFF ON OFF
0 1 0
Ah

Table 7. Diagnostic LED POST Code Decoder

Diagnostic LED Decoder
O = On, X = Off
Upper Nibble
4h 2h 1h
#6 #5 #4
X X O
X X O
X X O
X X O
X O X
Lower Nibble LEDs
LED #3 LED #2
8h 4h
ON ON
1 1
Lower Nibble
LSB
8h 4h 2h
#3 #2 #1
X X X X
X X X O
X X O X
X X O O
X X X O
Intel® Server Board S3420GP User Guide
LED #1 LED #0
2h 1h
OFF OFF
0 0
Ch
Description
1h
#0
Power-on initialization of
the host processor
(bootstrap processor)
Host processor cache
initialization (including AP)
Starting application
processor initialization
SMM initialization
Initializing a chipset
component