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B-9
Appendix B: AMIBIOS POST Diagnostic Error Messages
APPENDIX B
Check
Point Description
A9 Returned from adaptor ROM at E000h control.
Next, performing any initialization required after
the E000 option ROM had control.
AA Initialization after E000 option ROM control has
completed. Displaying the system configuration next.
AB Building the multiprocessor table, if necessary. POST
next.
B0 The system configuration is displayed.
AC Uncompressing the DMI data and initializing DMI.
B1 Copying any code to specific areas.
D0h The NMI is disabled. Power on delay is starting.
Next, the initialization cade 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 the system will go to checkpoint code
E0h. Otherwise, going to checkpoint code D7h.