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AMI UEFI BIOS POST Codes
A status code is a data value used to indicate progress during the boot phase. A subset
of these status codes, known commonly as checkpoints, indicate common phases of the
BIOS boot process.
Checkpoints are typically output to I/O port 80h, but Aptio 4.x core can be configured to
send status codes to a variety of sources. Aptio 4.x core outputs checkpoints throughout
the boot process to indicate the task the system is currently executing. Checkpoints are
very useful in aiding software developers or technicians in debugging problems that
occur during the pre-boot process.
A-1
Checkpoint Ranges
Status Code Range
0x01 – 0x0B
0x0C – 0x0F
0x10 – 0x2F
0x30 – 0x4F
0x50 – 0x5F
0x60 – 0x8F
0x90 – 0xCF
0xD0 – 0xDF
0xE0 – 0xE8
0xE9 – 0xEF
0xF0 – 0xF8
0xF9 – 0xFF
Appendix A
Table A-1. Checkpoint Ranges
Description
SEC execution
SEC errors
PEI execution up to and including memory detection
PEI execution after memory detection
PEI errors
DXE execution up to BDS
BDS execution
DXE errors
S3 Resume (PEI)
S3 Resume errors (PEI)
Recovery (PEI)
Recovery errors (PEI)
A-1
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