SUPER MICRO Computer 5010H, 5010E Bus Checkpoint Codes, Additional Bus Checkpoints, High Byte

Appendix B: AMIBIOS POST Checkpoint Codes

B-4 Bus Checkpoint Codes

The system BIOS passes control to different buses at the following checkpoints:

Checkpoint		Code Description
2Ah	Initializing the different bus system, static, and output devices, if present.
38h	Initialized bus input, IPL, and general devices, if present.
39h	Displaying bus initialization error messages, if any.
95h	Initializing bus adaptor ROMs from C8000h through D8000h.

Additional Bus Checkpoints

While control is inside the different bus routines, additional checkpoints are output to I/O port address 0080h as word to identify the routines being executed. These are word checkpoints.

The low byte of checkpoint is the system BIOS checkpoint where control is passed to the different bus routines.

The high byte of checkpoint indicates that the routine is being executed in Different buses.

High Byte

The high byte of these checkpoints includes the following information:

Bits		Description
Bits 7-4
0000	Function 0. Disable all devices on the bus.
0001	Function 1. Initialize static devices on the bus.
0010	Function 2. Initialize output devices on the bus.
0011	Function 3. Initialize input devices on the bus.
0100	Function 4. Initialize IPL devices on the bus.
0101	Function 5.	Initiate general devices on the bus.
0110	Function 6.	Initialize error reporting on the bus.
0111	Function 7.	Initialize add-on ROMs for all buses.

Bits 3-0Specify the bus

0Generic DIM Device Initialization Manager.

1Onboard System devices.

2ISA devices.

3EISA devices.

4ISA PnP devices.

5PCI devices.

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