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BIOS POST Checkpoint Codes
B-1
Uncompressed Initialization Codes
The uncompressed initialization checkpoint codes are listed in order of execution:
Checkpoint
D0h
D1h
D3h
D4h
D5h
B-2
Bootblock Recovery Codes
The bootblock recovery checkpoint codes are listed in order of execution:
Checkpoint
E0h
E1h
E2h
E6h
Edh
Efh
F0h
F1h
F2h
F3h
F4h
F5h
FBh
Appendix B
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.
Code Description
The onboard floppy controller if available is initialized. Next, beginning the base
512 KB memory test.
Initializing the interrupt vector table next.
Initializing the DMA and Interrupt controllers next.
Enabling the floppy drive controller and Timer IRQs. Enabling internal cache
memory.
Initializing the floppy drive.
A read error occurred while reading the floppy drive in drive A:.
Next, searching for the AMIBOOT.ROM file in the root directory.
The AMIBOOT.ROM file is not in the root directory.
Next, reading and analyzing the floppy diskette FAT to find the clusters occupied
by the AMIBOOT.ROM file.
Next, reading the AMIBOOT.ROM file, cluster by cluster.
The AMIBOOT.ROM file is not the correct size.
Next, disabling internal cache memory.
Next, detecting the type of flash ROM.
B-1
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