Appendix B: BIOS POST Checkpoint Codes

Appendix B

BIOS POST Checkpoint Codes

When AMIBIOS performs the Power On Self Test, it writes checkpoint codes to I/O port 0080h. If the computer cannot complete the boot process, diagnostic equipment can be attached to the computer to read I/O port 0080h.

B-1 Uncompressed Initialization Codes

The uncompressed initialization checkpoint codes are listed in order of execution:

Checkpoint

D0h

D1h

D3h

D4h

D5h

D6h

Code Description

The NMI is disabled. Power on delay is starting. Next, the initialization code checksum will be verified.

Initializing the DMA controller, performing the keyboard controller BAT test, starting memory refresh and entering 4 GB flat mode next.

Starting memory sizing next.

Returning to real mode. Executing any OEM patches and setting the Stack next.

Passing control to the uncompressed code in shadow RAM at E000:0000h. The initialization code is copied to segment 0 and control will be transferred to segment 0.

Control is in segment 0. Next, checking if <Ctrl> <Home> was pressed and verifying the system BIOS checksum. If either <Ctrl> <Home> was pressed or the system BIOS checksum is bad, next will go to checkpoint code E0h. Otherwise, going to checkpoint code D7h.

B-1

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SUPER MICRO Computer H8DCT-HLN4F user manual Appendix B Bios Post Checkpoint Codes, Uncompressed Initialization Codes

H8DCT-HLN4F specifications

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