5 Power-On Self-Test and Error Messages

Order in Which the Tests are Performed

Checkpoint

POST Routine Description

Code

 

 

 

 

The following are for boot block in Flash ROM

E0h

Initialize the chipset

 

 

E1h

Initialize the bridge

 

 

E2h

Initialize the CPU

 

 

E3h

Initialize system timer

 

 

E4h

Initialize system I/O

 

 

E5h

Check force recovery boot

 

 

E6h

Checksum BIOS ROM

 

 

E7h

Go to BIOS

 

 

E8h

Set Huge Segment

 

 

E9h

Initialize Multi Processor

 

 

EAh

Initialize OEM special code

 

 

EBh

Initialize PIC and DMA

 

 

ECh

Initialize Memory type

 

 

EDh

Initialize Memory size

 

 

EEh

Shadow Boot Block

 

 

EFh

System memory test

 

 

F0h

Initialize interrupt vectors

 

 

F1h

Initialize Run Time Clock

 

 

F2h

Initialize video

 

 

F3h

Initialize beeper

 

 

F4h

Initialize boot

 

 

F5h

Clear Huge segment

 

 

F6h

Boot to Mini DOS

 

 

F7h

Boot to Full DOS

 

 

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