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Why do you need to use bootstrap What is the advantage and disadvantage of using bootstrap?
Wiki User
∙ 7y ago
Without a bootstrap it would be impossible to boot a computer system but that's not really an advantage, it's a fundamental aspect of any computer system.
The term "bootstrap" derives from the phrase: "to lift oneself up by one's own bootstraps". This is clearly an impossibility, not unlike standing in a carrier bag and then trying to lift the bag with you still in it; it can't be done. However, as we'll see, it is an apt phrase when it comes to initialising a computer system and provides the origin of terminology such as "boot process" and "bootup".
On any computer system, most software is loaded and executed by other software that has previously been loaded and executed. For instance, the BIOS (Basic Input/Output System) performs some essential checks upon the system hardware before loading and executing the boot loader which loads and executes a chosen (or default) operating system, at which point the user can logon and subsequently load and execute their own choice of programs.
But given that we require a program or operating system in order to load and execute other programs, this presents us with a paradox during initial bootup. How does the very first program load and execute if there is no program present to load and execute it? The answer lies in the bootstrap. The bootstrap is a machine-code program that is permanently written to a read-only memory chip (ROM). Being read-only, the bootstrap cannot be changed other than by replacing the chip itself. Unlike programs stored in RAM (Random Access Memory), ROM programs do not require power to maintain state. Thus when power is restored to the system, the bootstrap is already in memory and can be executed automatically, at which point the bootstrap takes control of the system. Typically, a bootstrap will simply locate, load and execute the system's BIOS program which takes care of the POST (Power-On Self-Test) and prepares the system to load and execute the boot loader which takes care of the bulk of the boot process until the system is ready to load and execute an operating system, at which point the system has effectively lifted itself up by its own bootstraps.
Wiki User
∙ 7y ago
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