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When the PC starts up, the first job for the BIOS is to initialize and identify system devices such as the video display card, keyboard and mouse, hard disk, CD/DVD drive and other hardware. The BIOS then locates software held on a peripheral device (designated as a 'boot device'), such as a hard disk or a CD, and loads and executes that software, giving it control of the PC.This process is known as booting, or booting up, which is short for bootstrapping.
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Why do you need to use bootstrap What is the advantage and disadvantage of using bootstrap?
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.
Explain the Java class Loader architecture?
basic function of class loader is to read bytecodes into array and create namespace in namespace. there are two types of class loaders: promodia class loader and class loader objects 1. promodia class loader it loads all necessary classes required for VM, it is bootstrap class loader. 2. class loader objects there are 3 class loaders AppletClassLoader, RemoteClassLoader and SecurityClassloader. Sabarish R L
What is 8051 loader?
The Loader is a program that moves the executable file produced by linker from the secondary storage device to memory for execution
What are loaders and discuss various loading schemes with implementation of an absolute loader?
The loader is a program which accepts an object code and prepare them for execution.The loader's target language is machine language, its source language is nearly machine langugae.loading is ultimately bound with storage management function of operating systems and is usually performed later than assembly or compilation.the period of executions of user program is called execution time.the period of translating user's source program is called assembly or compile time. load time refers to the period of loading and preparing object program for execution. Loading schemes: 1.Absolute loader. 2.Relocating loader. 3.Direct linking loader. 4.Dynamic Loading. 5.Dynamic linking. Absolute loader: The task of an absolute loader is virtually trivial.The loader simply accepts machine language code and places it into main memory specified by the assembler. Relocating loader: The task of relocating loader is to avoid reassembling of of all subroutines when a subroutine is changed and to perform tasks of allocation and linking for programmer. Dynamic loading: In order to overlay structure to work it is necessary for the module loader to load the various procedures as they are needed.There are many binders capable of processing and allocating overlay structure.the portion of the laoder that actually intercepts calls and loads necessary procedure is called overlay supervisor of simplly flipper.this overall scheme is called dynamic loading or load on call. Dynamic linking: This is mechanism by which loading and linking of external references are postponed until execution time.This was made to sort out disadvantage of previous loading schemes like subroutine is referenced and never executed Implementation of Absolute loader: The four loader functions are performed as following: 1.Allocation- By programmer 2.Linking- By programmer 3.Relocation- By assembler 4.Loading- By loader
What is the difference between wheel loader and front end loader?
Difference between Front End Loader and Wheel Loader
What Bios bootstrap loader do you need for Ubuntu 14.04 lts?
Boot Loader Grab is the bootstrap loader that you need for Ubuntu 14.04.
What is meant by bootstrap loader?
Also known as bootstrapping or boot loader, a bootstrap loader is a program that resides in the computers EPROM, ROM, or other non-volatile memory that automatically executed by the processor when the computer is turned on. The bootstrap loader reads the hard disk drives boot sector to continue the process of loading the computers operating system. The boot loader has been replaced in computers that have an Extensible Firmware Interface (EFI). The boot loader is now part of the EFI BIOS. Source: http://www.computerhope.com/jargon/b/bootload.htm
What is the function of the bootstrap loader?
To Test Your hardware on boot
When a computer is first turned on or restart a special type of absolute loader boot loader or bootstrap loader?
strep boot
What BIOS routine locates the device with a readable MBR?
Is the bootstrap loader.
What is db-loader?
Relative to computer usage a db-loader is a program that does bulk uploading or downloading to databases. It is especially helpful when transferring to new software.
What is Function of loader in system software?
Whenever the assembly program is to be executed, it has to be assembled again; Programs ...loads the first program to be run by the computer -- usually an operating system ...
What is the name of the Windows NT2000XP boot loader program?
In order to answer the question, one would need to know for which operating system the "bootstrap loader" or boot loader is intended. There have been many boot loaders since electronic computers capable of running stored programs were first developed. Some of the earliest bootstrap loaders had no name at all; they were merely a list of steps one would execute to flip switches on the front panel of a computer to enter a rudimentary set of instructions that would allow the computer to finish loading its operating program from a paper tape reader or stack of punched cards. One popular boot loader used with Linux systems today is called GRUB, which stands for "Grand Unified Boot Loader".
What is the origin term of the term booting?
Well, the computer term came from "bootstrap loader" which was a very short program that could hand off to something more complex. In turn, "bootstrap loader" came from the idiom to pull oneself up by the bootstraps, meaning to get going, put in extra effort, and solve the problem yourself. More modern slang might be "get over it," "deal with it," or "suck it up." The bootstrap idiom comes from a story by Baron Munchausen who claimed to have pulled himself up by the bootstraps to carry himself out of a swamp where he was sinking.
What is the origin of the term booting?
Well, the computer term came from "bootstrap loader" which was a very short program that could hand off to something more complex. In turn, "bootstrap loader" came from the idiom to pull oneself up by the bootstraps, meaning to get going, put in extra effort, and solve the problem yourself. More modern slang might be "get over it," "deal with it," or "suck it up." The bootstrap idiom comes from a story by Baron Munchausen who claimed to have pulled himself up by the bootstraps to carry himself out of a swamp where he was sinking.
Which component of the boot sequence analyzes hardware devices before loading the operating system?
bootstrap loader
How could a system be designed to allow a choice of operating system to boot from. what would the bootstrap program need to do?
On most computer systems, a small piece of code known as the bootstrap program or bootstrap loader locates the kernel loads it into main memory and startsits execution. Some computer systems, such as PCs, use a two-step process in which a simple bootstrap loader fetches a more complex boot program from disk, which in turn loads the kernel. The bootstrap program can perform a variety of tasks. Usually, one task is to run diagnostics to determine with the booting steps. It can also initialize all aspects of the system, from CPU registers to device controllers and the contents of main memory. Sooner or later, it starts the operating system.
