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B-1
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 Code Description
D0h
The NMI is disabled. Power on delay is starting. Next, the initialization code check-
sum will be verifi ed.
D1h
Initializing the DMA controller, performing the keyboard controller BAT test, starting
memory refresh and entering 4 GB fl at mode next.
D3h
Starting memory sizing next.
D4h
Returning to real mode. Executing any OEM patches and setting the Stack next.
D5h
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.
Summary of Contents for AS2021M-82R+
Page 1: ...AS2021M T2R AS2021M 82R USER S MANUAL 1 0 ...
Page 5: ...v Preface Notes ...
Page 10: ...Notes x AS2021M T2R 2021M 82R User s Manual ...
Page 21: ...Chapter 2 Server Installation 2 5 Figure 2 1 Installing Chassis Rails ...
Page 23: ...Chapter 2 Server Installation 2 7 Figure 2 2 Installing the Server into a Rack ...
Page 25: ...Chapter 2 Server Installation 2 9 Figure 2 3 Accessing the Inside of the System ...
Page 30: ...AS2021M T2R 2021M 82R User s Manual 3 4 Notes ...
Page 92: ...A 2 AS2021M T2R 2021M 82R User s Manual Notes ...
Page 100: ...B 8 AS2021M T2R 2021M 82R User s Manual Notes ...
Page 104: ...C 4 AS2021M T2R 2021M 82R User s Manual Notes ...