Manual Number: 40110-005-2
Page 91
Code
Description
A8
Initialization before passing control to adapter ROM at E000H completed. Passing
control to adapter ROM at E000H next.
A9
Returned from E000 ROM control. Going to do any initialization required after
E000 option ROM control.
AA
Initialization after E000H option ROM control completed. Displaying system
configuration next.
AB
Uncompressing DMI data and executing DMI POST initialization next.
B0
System configuration is displayed.
B1
Copying any code to specific areas.
00
Copying of code to specific areas done. Passing control to INT 19H boot loader
next.
The System BIOS passes control to the different buses at the following checkpoints to do various
tasks:
Code
Description
2A
Initializing different bus system, static and output devices, if present.
38
Initializing bus input, IPL and general devices, if present.
39
Displaying bus initialization error messages, if any.
95
Initializing bus adapter ROM’s from C8000H through D8000H.
Additional BUS Checkpoints
While control is in the different bus routines, additional checkpoints are output to Port 80H 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,
and the HIGH BYTE of checkpoint indicates that the routine is being executed in different buses.
The information included in the high and low bytes of these checkpoints is detailed on the next
page.
High Byte
The additional bus checkpoints listed above include 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 ROM’s for all buses.
Summary of Contents for SB686P Series
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