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Hello everyone, today we are going to learn about the structure of BIOS

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There are two parts to this lesson: What is a BIOS and the structure of a BIOS

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First of all, what is BIOS

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BIOS, the basic input output system,

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It is a set of programs engraved on a chip on the mainboard

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This chip we call the Flash chip

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We habitually refer to the flash chip with the BIOS program as BIOS

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A lot of problems in the system and hardware can be corrected through the BIOS program

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For example, some mainboards install the higher end CPU,

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there will be a blue screen of death, or failure to enter the system,

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and a variety of hardware compatibility problems,

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can be corrected by updating the BIOS program

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The BIOS function is very powerful,

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it contains the computer's important boot self-test procedures, system startup procedures,

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interrupt service procedures

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It can also read and write system setup information from CMOS and can modify the time

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The main function of BIOS is to provide the computer with the lowest level

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of the most direct hardware setup and control

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Today's BIOS is basically UEFI BIOS

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The UEFI BIOS manufacturers are AMI, phoenix, and Insyde

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These are the three manufacturers that provide UEFI BIOS source code

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Every mainboard manufacturer is to the 3 BIOS manufacturers to buy the program,

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and then add some of their own DMI information,

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and then written to the mainboard, into the mainboard BIOS

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DMI is Desktop Management Interface,

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is a help to collect computer system information management system

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UEFI BIOS is usually divided into four parts

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We partition the Flash ROM as a hard disk, divided into four areas

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The first field writes the file description, which is a file header

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The second area is the firmware of the network adapter, GbE FW

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The third area stores the Intel ME firmware for the chipset, Intel ME FW

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Part 4 is the main BIOS program

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The main BIOS program, some will also add some graphics card procedures, EC procedures and so on

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Ok, this is the UEFI BIOS structure