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Chapter 5 Basic Input/Output System (BIOS)

Chapter 5 Basic Input/Output System (BIOS). 5.1 Introduction to BIOS 5.2 The BIOS Boot Process 5.3 Configuring the BIOS. 5.1 Introduction to BIOS. Basic Input / Output System (BIOS) boot the computer by providing a basic set of instructions

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Chapter 5 Basic Input/Output System (BIOS)

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  1. Chapter 5 Basic Input/Output System (BIOS) • 5.1 Introduction to BIOS • 5.2 The BIOS Boot Process • 5.3 Configuring the BIOS

  2. 5.1 Introduction to BIOS • Basic Input / Output System (BIOS) • boot the computer by providing a basic set of instructions • load the operating system after turning on the computer • perform POST (Power-On Self Test) • provide set-up program for changing BIOS parameters • provide low-level routines for the communications between OS and hardware devices

  3. 5.1 Introduction to BIOS • BIOS combination • BIOS program • CMOS stores BIOS program • BIOS parameter

  4. 5.1 Introduction to BIOS • Advantages of storing BIOS in ROM • code and data are readily available during booting • BIOS content are not corrupted by errant applications • BIOS hardware components • BIOS ROM • PC startup program (POST) • BIOS CMOS memory • house the configuration information of individual PC

  5. 5.1 Introduction to BIOS • The BIOS ROM • All BIOS are contained in ROM in old days • BIOS is now located in EEPROM chip • erased and rewritten by special programs • called flash BIOS • BIOS CMOS memory • provide a non-volatile storage for PC’s control information • need very little power to operate • powered by lithium battery

  6. 5.1 Introduction to BIOS • BIOS chip

  7. 5.2 The BIOS Boot Process 1. The power supply sends a signal to the components in the system unit. 2. The CPU finds the ROM chips that contains BIOS. 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. 5.2 The BIOS Boot Process 5. The BIOS looks for the system files in floppy disk drive and hard disk. 6. The system files and the kernel of the OS load into RAM from hard disk.

  9. 5.2 The BIOS Boot Process • Beep codes • A series of beep: BIOS program encounter problems • One short beep: everything is normal • Errors can be indicated when video screen does not function • Interpret the beep codes by consulting main board menu

  10. 5.2 The BIOS Boot Process • POST Error messages • Error messages are shown on display system • Interpret error messages by consulting owner’s manual

  11. 5.3 Configuring the BIOS • Setup program interfaces 1. Hit a particular key or key combination at a right time to enter the BIOS setup utility

  12. 5.3 Configuring the BIOS • Setup program interfaces 2. A BIOS setup screen is displayed.

  13. 5.3 Configuring the BIOS • Typical key control • Incorrect settings of BIOS may lead to system halt • Quit the setup without saving changes if we are not sure about the changed settings • Boot sequence • control the order in which BIOS looks for an OS on start-up • usual sequence: floppy disk  hard disk  CD-ROM

  14. 5.3 Configuring the BIOS • Typical key control • Performance tuning through BIOS settings • BIOS settings are responsible for how the chipset is controlled. • Chipset is the key to the overall system performance • BIOS parameters: • Choose the optimal bus speed settings • Enable the CPU’s internal cache • External cache memory • Enable system BIOS shadowing • Quick power-on self test • Update the BIOS

  15. END

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