HP Vectra Vli 8SF Spezifikationen PDF herunterladen (Seite 53)

4 BIOS Overview

Order in Which the POST Tests are Performed

Each time the system is powered on, or a reset is performed, the POST is

executed. The POST process verifies the basic functionality of the system

components and initializes certain system parameters.

The POST starts by displaying a graphic screen of the Hewlett-Packard logo

when the PC is restarted.

Devices, such as memory and newly installed hard disks, are configured

automatically. The user is not requested to confirm the change. Newly

removed hard disks are detected, and the user is prompted to confirm the

new configuration by pressing . Note, though, that the POST does not

detect when a hard disk drive has been otherwise changed.

During the POST, the BIOS and other ROM data is copied into high-speed

shadow RAM. The shadow RAM is addressed at the same physical location as

the original ROM in a manner which is completely transparent to applications.

It therefore appears to behave as very fast ROM. This technique provides

faster access to the system BIOS firmware.

The following table lists the POST checkpoint codes written at the start of

each test.

Checkpoint

Code

POST Routine Description

02h Verify Real Mode

03h Disable Non-Maskable Interrupt (NMI)

04h Get CPU type

06h Initialize system hardware

08h Initialize chipset with initial POST values

09h Set IN POST flag

0Ah Initialize CPU registers

0Bh Enable CPU cache

0Ch Initialize caches to initial POST values

0Eh Initialize I/O component

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HP Vectra Vli 8SF Spezifikationen Seite 53