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AMIBIOS POST Checkpoint Codes
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 checksum will be
verified.
D1h Initializing the DMA controller, performing the
keyboard controller BAT test, starting memory
refresh, and entering 4 GB flat 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.
D6h 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.
aa300.book Page 121 Tuesday, December 17, 2002 5:27 PM