Specifications

Appendix B: POST Code Diagnostic LED Decoder
Revision 1.3
Intel order number E44588-003
47
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
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
0xF5h O O O O X O X O Exiting Sleep state
0xF8h O O O O O X X X
Operating system has requested EFI to close boot services
(ExitBootServices ( ) Has been called)
0xF9h O O O O O X X O
Operating system has switched to virtual address mode
(SetVirtualAddressMap ( ) Has been called)
0xFAh O O O O O X O X
Operating system 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