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4.2 AMIBIOS Post Code (Aptio)
The POST code checkpoints are the largest set of checkpoints during the BIOS pre-
boot process. The following table describes the type of checkpoints that may occur
during the POST portion of the BIOS:
Checkpoint Ranges
Status Code Range Description
0x01 – 0x0B SEC execution
0x0C – 0x0F SEC errors
0x10 – 0x2F PEI execution up to and including memory detection
0x30 – 0x4F PEI execution after memory detection
0x50 – 0x5F PEI errors
0x60 – 0x8F DXE execution up to BDS
0x90 – 0xCF BDS execution
0xD0 – 0xDF DXE errors
0xE0 – 0xE8 S3 Resume (PEI)
0xE9 – 0xEF S3 Resume errors (PEI)
0xF0 – 0xF8 Recovery (PEI)
0xF9 – 0xFF Recovery errors (PEI)
Standard Checkpoints
SEC Phase
Status Code Description
0x00 Not used
Progress Codes
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 OEM initialization before microcode loading
0x06 Microcode loading
0x07 AP initialization after microcode loading
0x08 North Bridge initialization after microcode loading
0x09 South Bridge initialization after microcode loading
0x0A OEM initialization after microcode loading
0x0B Cache initialization