Appendix C: LED Decoder
164 Intel
®
Server Board S2600CP Intel
®
Server System P4000CP Family Service Guide
The LEDs are decoded as follows:
Table 11. POST Progress Code LED Example
LEDs
Upper Nibble AMBER LEDs Lower Nibble GREEN LEDs
MSB 7 6 5 4 3 2
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
Decode
Result
1 0 1 0 1 1 0
0
Ah Ch
The following table provides a list of all POST progress codes.
Table 12. POST Progress Code Decoder
Checkpoint
Diagnostic LED Decoder
Description
1 = LED On, 0 = LED Off
Upper Nibble Lower Nibble
MSB LSB
8h 4h 2h 1h 8h 4h 2h 1h
LED # #7 #6 #5 #4 #3 #2 #1 #0
SEC Phase
01h 0 0 0 0 0 0 0 1 First POST code after CPU reset
02h 0 0 0 0 0 0 1 0 Microcode load begin
03h 0 0 0 0 0 0 1 1 CRAM initialization begin
04h 0 0 0 0 0 1 0 0 Pei Cache When Disabled
05h 0 0 0 0 0 1 0 1 SEC Core At Power On Begin.
06h 0 0 0 0 0 1 1 0 Early CPU initialization during Sec Phase.
07h 0 0 0 0 0 1 1 1 Early SB initialization during Sec Phase.
08h 0 0 0 0 1 0 0 0 Early NB initialization during Sec Phase.
09h 0 0 0 0 1 0 0 1 End Of Sec Phase.
0Eh 0 0 0 0 1 1 1 0 Microcode Not Found.
0Fh 0 0 0 0 1 1 1 1 Microcode Not Loaded.
PEI Phase
10h 0 0 0 1 0 0 0 0 PEI Core
11h 0 0 0 1 0 0 0 1 CPU PEIM
15h 0 0 0 1 0 1 0 1 NB PEIM
19h 0 0 0 1 1 0 0 1 SB PEIM
MRC Process Codes – MRC Progress Code Sequence is executed - See Table 63
PEI Phase continued…
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