Intel
®
Server Board S5500BC TPS
Appendix D: POST Code Diagnostic LED Decoder
Revision 1.0
Intel order number: E42249-003
101
Diagnostic LED Decoder
O = On, X=Off
Upper Nibble
Lower Nibble
MSB
LSB
Checkpoint
8h 4h 2h 1h 8h 4h 2h 1h
LED
#7 #6 #5 #4 #3 #2 #1 #0
Description
0x99h O X X O O X X O Detecting
the
mouse
0x9Ah O X X O O X O X Detecting the presence of mouse
0x9Bh O X X O O X O O Enabling
the
mouse
Fixed Media
0xB0h O X O O X X X X Resetting
fixed
media
device
0xB1h O X O O X X X O Disabling
fixed
media
device
0xB2h O X O O X X O X
Detecting presence of a fixed media device (hard drive detection,
and so forth.)
0xB3h
O
X
O
O
X
X
O
O
Enabling / configuring a fixed media device
Removable Media
0xB8h O X O O O X X X Resetting
removable
media
device
0xB9h O X O O O X X O Disabling
removable
media
device
0xBAh O X O O O X O X
Detecting presence of a removable media device (CDROM detection,
and so forth.)
0xBCh
O
X
O
O
O
O
X
X
Enabling / configuring a removable media device
Boot Device Selection (BDS)
0xD0
O
O
X
O
X
X
X
X
Trying to boot device selection 0
0xD1
O
O
X
O
X
X
X
O
Trying to boot device selection 1
0xD2
O
O
X
O
X
X
O
X
Trying to boot device selection 2
0xD3
O
O
X
O
X
X
O
O
Trying to boot device selection 3
0xD4
O
O
X
O
X
O
X X
Trying to boot device selection 4
0xD5
O O X O X
O
X
O
Trying to boot device selection 5
0xD6
O O X O X
O
O
X
Trying to boot device selection 6
0Xd7
O O X O X
O
O
O
Trying to boot device selection 7
0xD8
O O X O O
X
X
X
Trying to boot device selection 8
0xD9
O O X O O
X
X
O
Trying to boot device selection 9
0xDA
O O X O O
X
O
X
Trying to boot device selection A
0xDB
O O X O O
X
O
O
Trying to boot device selection B
0xDC
O O X O O
O
X
X
Trying to boot device selection C
0xDD
O O X O O
O
X
O
Trying to boot device selection D
0xDE
O O X O O
O
O
X
Trying to boot device selection E
0xDF
O
O
X
O
O
O
O
O
Trying to boot device selection F
Pre-EFI Initialization (PEI) Core
0xE0h O O O X X X X X Started dispatching early initialization modules (PEIM)
0xE1h O O O X X X X O Reserved
for Initializaiton module use (PEIM)
0xE2h O O O X X X O X Initial
memory
found, configured, and installed correctly
0xE3h
O
O
O
X
X
X
O
O
Reserved for Initializaiton module use (PEIM)
Driver eXecution Environment (DXE) Core (not accompanied by a beep code)
0xE4h
O
O
O
X
X
O
X
X
Entered EFI driver execution phase (DXE)
0xE5h O O O X X O X O Started dispatching drivers
0xE6h O O O X X O O X Started
connecting
drivers
DXE Drivers
0xE7h O O O X O O X O Waiting
for
user
input
0xE8h O O O X O X X X Checking
password
0xE9h O O O X O X X O Entering
BIOS
setup
0xEAh O O O X O X O X Flash
Update
0xEEh
O
O
O
X
O
O
O
X
Calling Int 19. One beep unless silent boot is enabled.
0xEFh O O O X O O O O Unrecoverable boot failure
Runtime Phase / EFI Operating System Boot
0xF4h O O O O X O X X Entering
Sleep
state
