52 Intel
®
Server Board S5500BC User’s Guide
• Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
Table 7. POST Progress Code LED Example
LEDs
Upper Nibble LEDs Lower Nibble LEDs
MSB LSB
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 1 0101 1 0 0
Ah Ch
Table 8. 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
To Next Page
Loading...
Need help?
General
