4. BIOS POST Codes
POST Codes are diagnostic codes sent by the BIOS to IO address 0x80. A POST adapter needs to be installed
in the system to view these POST Codes. Codes not listed are reserved by AMI.
Table B-1: BIOS POST Codes
POST Code
Description
0x01
Power on. Reset type detection (soft/hard)
0x02
AP initialization before microcode loading
0x03
North Bridge initialization before microcode loading
0x04
South Bridge initialization before microcode loading
0x05
Unused
0x06
Microcode loading
0x07
AP initialization after microcode loading
0x08
North Bridge initialization after microcode loading
0x09
South Bridge initialization after microcode loading
0x0A
Unused
0x0B
Cache initialization
0x0E
Microcode not found
0x0F
Microcode not loaded
0x10
PEI Core is started
0x11
Pre-memory CPU initialization is started
0x12
Pre-memory CPU initialization (CPU module specific)
0x13
Pre-memory CPU initialization (CPU module specific)
0x14
Pre-memory CPU initialization (CPU module specific)
0x15
Pre-memory North Bridge initialization is started
0x16
Pre-Memory North Bridge initialization (North Bridge module
specific)
0x17
Pre-Memory North Bridge initialization (North Bridge module
specific)