powerpoint-module b-modb ch05 eng (1)

8/13/2019 Powerpoint-module B-ModB Ch05 Eng (1)

1/15

Chapter 5 Basic Input/Output

System (BIOS) 5.1 Introduction to BIOS

5.2 The BIOS Boot Process

5.3 Configuring the BIOS


2/15

5.1 Introduction to BIOSBasic Input / Output System (BIOS)

boot the computer by providing a basic set of

instructionsload the operating system after turning on the

computer

perform POST (Power-On Self Test)

provide set-up program for changing BIOSparameters

provide low-level routines for the

communications between OS and hardware

devices


3/15

5.1 Introduction to BIOSBIOS combination

BIOS program

CMOS stores BIOS programBIOS parameter


4/15

5.1 Introduction to BIOSAdvantages of storing BIOS in ROM

code and data are readily available during booting

BIOS content are not corrupted by errantapplications

BIOS hardware components

BIOS ROM

PC startup program (POST)

BIOS CMOS memory

house the configuration information of individual PC


5/15

5.1 Introduction to BIOSThe BIOS ROM

All BIOS are contained in ROM in old days

BIOS is now located in EEPROM chiperased and rewritten by special programs

called flash BIOS

BIOS CMOS memory

provide a non-volatile storage for PCs controlinformation

need very little power to operate

powered by lithium battery


6/15

5.1 Introduction to BIOSBIOS chip


7/15

5.2 The BIOS Boot Process1. The power supply sends a signal to the

components in the system unit.

2. The CPU finds the ROM chips that containsBIOS.

3. The BIOS performs the POST which checks

components (e.g. mouse, keyboard

connectors and expansion card)

4. The results of the POST are compared with

data in the CMOS chip.


8/15


9/15

5.2 The BIOS Boot ProcessBeep codes

A series of beep: BIOS program encounter

problemsOne short beep: everything is normal

Errors can be indicated when video screen does

not function

Interpret the beep codes by consulting mainboard menu


10/15

5.2 The BIOS Boot ProcessPOST Error messages

Error messages are shown on display system

Interpret error messages by consulting ownersmanual


11/15

5.3 Configuring the BIOSSetup program interfaces

1. Hit a particular key or key combination at a right

time to enter the BIOS setup utility


12/15

5.3 Configuring the BIOSSetup program interfaces

2. A BIOS setup screen is displayed.


13/15

5.3 Configuring the BIOSTypical key control

Incorrect settings of BIOS may lead to system halt

Quit the setup without saving changes if we arenot sure about the changed settings

Boot sequence

control the order in which BIOS looks for an OS on

start-upusual sequence: floppy diskhard diskCD-ROM


14/15

5.3 Configuring the BIOSTypical key control

Performance tuning through BIOS settings

BIOS settings are responsible for how the chipset iscontrolled.

Chipset is the key to the overall system performance

BIOS parameters:

Choose the optimal bus speed settings

Enable the CPUs internal cache External cache memory

Enable system BIOS shadowing

Quick power-on self test

Update the BIOS


15/15

END

powerpoint-module b-modb ch05 eng (1)

Documents