Powerpoint-module B-ModB Ch05 Eng (1)
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Transcript of Powerpoint-module B-ModB Ch05 Eng (1)
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Chapter 5 Basic Input/Output
System (BIOS) 5.1 Introduction to BIOS
5.2 The BIOS Boot Process
5.3 Configuring the BIOS
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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
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5.1 Introduction to BIOSBIOS combination
BIOS program
CMOS stores BIOS programBIOS parameter
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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
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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
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5.1 Introduction to BIOSBIOS chip
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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.
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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
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5.2 The BIOS Boot ProcessPOST Error messages
Error messages are shown on display system
Interpret error messages by consulting ownersmanual
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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
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5.3 Configuring the BIOSSetup program interfaces
2. A BIOS setup screen is displayed.
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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
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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
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END