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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
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
1
2
3
4
5
6
7
8
9
A
Pre-Memory System Agent initialization
16 - 18
(System Agent module specific)
19
Pre-memory PCH initialization is started
Pre-memory PCH initialization (PCH
1A - 1C
module specific)
Memory initialization. Serial Presence
2B
Detect (SPD) data reading
Memory initialization. Memory presence
2C
detection
Memory initialization. Programming
2D
memory timing information
Memory initialization. Configuring
2E
memory
2F
Memory initialization (other)
31
Memory Installed
32
CPU post-memory initialization is started
CPU post-memory initialization. Cache
33
initialization
CPU post-memory initialization.
34
Application Processor(s) (AP)
initialization
CPU post-memory initialization. Boot
35
Strap Processor (BSP) selection
CPU post-memory initialization. System
36
Management Mode (SMM) initialization
Post-Memory System Agent initialization
37
is started
Post-Memory System Agent initialization
38 - 3A
(System Agent module specific)
3B
Post-Memory PCH initialization is started
B
C
D
E
F
LED Status Indicators
33
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