Service Guide

74 Intel
®
Server System SR1690WB Service Guide
• Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are
concatenated as ACh.
8h 4h 2h 1h 8h 4h 2h 1h
Status ON OFF ON OFF ON OFF ON OFF
Results 1 0101 1 0 0
Ah Ch
Table 9. POST Progress Code LED Example
Table 10. Diagnostic LED POST Code Decoder
Diagnostic LED Decoder
Checkpoint 1 = On, 0= 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 0 0 0 1 0000Power-on initialization of
the host processor
(bootstrap processor)
0x11h 0 0 0 1 0001 Host processor cache
initialization (including AP)
0x12h 0 0 0 1 001 0 Starting application
processor initialization
0x13h 0 0 0 1 0011SMM initialization
0x14h 0 0 0 1 0 1 0 0 Selection of Processor
with least feature use as
Boot Strap Processor
0x15h 0 0 0 1 0 1 0 1 Switch an AP processor to
become the new Boot
Strap Processor
Chipset
0x21h 0 0 1 0001 0 Initializing a chipset
component
Memory