5 Power-On Self-Test and Error Messages

Order in Which the Tests are Performed

Checkpoint

POST Routine Description

Code

 

 

 

2Ah

Clear 512 KB base RAM

 

 

32h

Test CPU bus-clock frequency

 

 

33h

Initialize POST Dispatch Manager

 

 

34h

Test CMOS RAM

 

 

35h

Initialize alternate chipset registers

 

 

36h

Warm start shutdown

 

 

37h

Reinitialize the chipset (MB only)

 

 

38h

Shadow system BIOS ROM

 

 

39h

Reinitialize the cache (MB only)

 

 

3Ah

Autosize cache

 

 

3Ch

Configure advanced chipset registers

 

 

3Dh

Load alternate registers with CMOS values

 

 

40h

Set initial CPU speed

 

 

42h

Initialize interrupt vectors

 

 

44h

Initialize BIOS interrupts

 

 

45h

POST device initialization

 

 

47h

Initialize manager for PCI Option ROMs (Rel. 5.1 and earlier)

 

 

48h

Check video configuration against CMOS

 

 

49h

Initialize PCI bus and devices

 

 

4Ah

Initialize all video adapters in system

 

 

4Bh

Display QuietBoot screen

 

 

4Ch

Shadow video BIOS ROM

 

 

4Eh

Display BIOS copyright notice

 

 

50h

Display CPU type

 

 

51h

Initialize EISA board

 

 

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