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Debug Code LED
The Debug Code LED displays progress and error codes during and after POST. Refer
to the Debug Code LED table for details.
Hexadecimal Character Table
Hexadecimal
0
Debug Code
0 1 2 3 4 5 6 7 8 9 A B C D E F
LED display
Boot Phases
Security (SEC) – initial low-level initialization
Pre-EFI Initialization (PEI) – memory initialization
Driver Execution Environment (DXE) – main hardware initialization
Boot Device Selection (BDS) – system setup, pre-OS user interface & selecting a
bootable device (CD/DVD, HDD, USB, Network, Shell, ...)
Debug Code LED Table
SEC Progress Codes
Power on. Reset type detection (soft/
01
hard)
02
AP initialization before microcode loading
System Agent initialization before
03
microcode loading
PCH initialization before microcode
04
loading
06
Microcode loading
07
AP initialization after microcode loading
System Agent initialization after
08
microcode loading
09
PCH initialization after microcode loading
0B
Cache initialization
Debug Code LED
1
2
3
4
5
6
7
8
9
A
SEC Error Codes
0C - 0D
Reserved for future AMI SEC error codes
0E
Microcode not found
0F
Microcode not loaded
PEI Progress Codes
10
PEI Core is started
11
Pre-memory CPU initialization is started
Pre-memory CPU initialization (CPU
12 - 14
module specific)
Pre-memory System Agent initialization
15
is started
Pre-Memory System Agent initialization
16 - 18
(System Agent module specific)
19
Pre-memory PCH initialization is started
B
C
D
E
F
Onboard LEDs
47
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