User guide

BIOS POST Checkpoints C-3

Table C-1 POST Checkpoint List

Checkpoint Description

6Ch

• FDD testing & parameter table setup

Note:

The FDD LED should flash once and its head should be positioned

88h

• HDD testing & parameter table setup

89h

• Get CPU MUX

Note:

This routine is to identify the user-set CPU frequency, not CPU-required frequency

90h

• Display POST status if necessary

93h

• Rehook int1c for quiet boot

94h

• Initialize I/O ROM

A4h

• Initialize security feature

A8h

• Setup SMI parameters

A0h

• Initialize Timer counter for DOS use

ACh

• Enable NMI

• Enable parity checking

• Set video mode

B0h

• Power-on password checking

• Display configuration table

• Clear memory buffer used for POST

• Select boot device