Technical Product Specification

Appendix D: POST Code Diagnostic LED Decoder Intel® Server Board S5520UR and S5520URT TPS
Intel order number E44031-012 Revision 1.9
154
Checkpoint
Diagnostic LED Decoder
Description
O = On, X=Off
Upper Nibble
Lower Nibble
MSB
LSB
8h
4h
2h
1h
8h
4h
2h
1h
LED
#7
#6
#5
#4
#3
#2
#1
#0
0xF5h
O
O
O
O
X
O
X
O
Exiting Sleep state
0xF8h O O O O O X X X
OS has requested EFI to close boot services (ExitBootServices ( )
Has been called)
0xF9h O O O O O X X O
OS has switched to virtual address mode (SetVirtualAddressMap ( )
Has been called)
0xFAh O O O O O X O X
OS has requested the system to reset (ResetSystem ( ) has been
called)
Pre-EFI Initialization Module (PEIM)/Recovery
0x30h X X O O X X X X Crisis recovery has been initiated because of a user request
0x31h
X
X
O
O
X
X
X
O
Crisis recovery has been initiated by software (corrupt flash)
0x34h
X
X
O
O
X
O
X
X
Loading crisis recovery capsule
0x35h X X O O X O X O Handing off control to the crisis recovery capsule
0x3Fh
X
X
O
O
O
O
O
O
Unable to complete crisis recovery capsule