Introduction

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In computing, booting (or booting up) is the initialization of a computerized system. The system can be a computer or a computer appliance. The booting process can be “hard”, after electrical power to the CPU is switched from off to on (in order to diagnose particular hardware errors), or “soft”, when thosepower-on self-tests (POST) can be avoided. Soft booting can be initiated by hardware such as a button press, or by software command. Booting is complete when the normal, operative, runtime environment is attained.

A boot loader is a computer program that loads an operating system or some other system software for the computer after completion of the power-on self-tests; it is the loader for the operating system itself, which has its own loader for loading ordinary user programs and libraries. Within the hard reboot process, it runs after completion of the self-tests, then loads and runs the software. A boot loader is loaded into main memory from persistent memory, such as a hard disk drive or, in some older computers, from a medium such as punched cards, punched tape, or magnetic tape. The boot loader then loads and executes the processes that finalize the boot. Like POST processes, the boot loader code comes from a “hard-wired” and persistent location; if that location is too limited for some reason, that primary boot loader calls a second-stage boot loader or a secondary program loader.

On modern general purpose computers, the boot up process can take tens of seconds, and typically involves performing a power-on self-test, locating and initializing peripheral devices, and then finding, loading and starting an operating system. The process of hibernating or sleeping does not involve booting. Minimally, some embedded systems do not require a noticeable boot sequence to begin functioning and when turned on may simply run operational programs that are stored in ROM. All computing systems are state machines, and a reboot may be the only method to return to a designated zero-state from an unintended, locked state.

Boot is short for bootstrapor bootstrap load and derives from the phrase to pull oneself up by one’s bootstraps. The usage calls attention to the requirement that, if most software is loaded onto a computer by other software already running on the computer, some mechanism must exist to load the initial software onto the computer.Early computers used a variety of ad-hoc methods to get a small program into memory to solve this problem. The invention ofread-only memory (ROM) of various types solved this paradox by allowing computers to be shipped with a start up program that could not be erased. Growth in the capacity of ROM has allowed ever more elaborate start up procedures to be implemented.

History

There are many different methods available to load a short initial program into a computer. These methods reach from simple, physical input to removable media that can hold more complex programs.

Pre integrated-circuit-ROM examples

Early computers

Early computers in the 1940s and 1950s were one-of-a-kind engineering efforts that could take weeks to program and program loading was one of many problems that had to be solved. An early computer, ENIAC, had no “program” stored in memory, but was set up for each problem by a configuration of interconnecting cables. Bootstrapping did not apply to ENIAC, whose hardware configuration was ready for solving problems as soon as power was applied.

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In 1960, the Ballistic Missile Early Warning System Display Information Processor (DIP) in Colorado Springs—before the NORAD facility was built in the underground Cheyenne Mountain Complex—ran only one program, which carried its own startup code. The program was stored as a bit image on a continuously running magnetic drum, and loaded in a fraction of a second. Core memory was probably cleared manually via the maintenance console, and startup from when power was fully up was very fast, only a few seconds. In its general design, the DIP compared roughly with aDEC PDP-8.

First commercial computers

The first programmable computers for commercial sale, such as the UNIVAC I and the IBM 701included features to make their operation simpler. They typically included instructions that performed a complete input or output operation. The same hardware logic could be used to load the contents of a punch card or other input media that contained a bootstrap program by pressing a single button. This booting concept was called a variety of names for IBMcomputers of the 1950s and early 1960s, but IBM used the term “Initial Program Load” with the IBM 7030 Stretch and later used it for their mainframe lines, starting with the System/360 in 1964.

Initial program load punched card for the IBM 1130 (1965)

The IBM 701 computer (1952–1956) had a “Load” button that initiated reading of the first 36-bit word into main memory from a punched card in a card reader, a magnetic tape in a tape drive, or a magnetic drum unit, depending on the position of the Load Selector switch. The left 18-bit half-word was then executed as an instruction, which usually read additional words into memory.The loaded boot program was then executed, which, in turn, loaded a larger program from that medium into memory without further help from the human operator. The term “boot” has been used in this sense since at least 1958.

IBM System/3 console from the 1970s. Program load selector switch is lower left; Program load switch is lower right.

Other IBM computers of that era had similar features. For example, the IBM 1401 system (c. 1958) used a card reader to load a program from a punched card. The 80 characters stored in the punched card were read into memory locations 001 to 080, then the computer would branch to memory location 001 to read its first stored instruction. This instruction was always the same: move the information in these first 80 memory locations to an assembly area where the information in punched cards 2, 3, 4, and so on, could be combined to form the stored program. Once this information was moved to the assembly area, the machine would branch to an instruction in location 080 (read a card) and the next card would be read and its information processed.

Another example was the IBM 650 (1953), a decimal machine, which had a group of ten 10-position switches on its operator panel which were addressable as a memory word (address 8000) and could be executed as an instruction. Thus setting the switches to 7004000400 and pressing the appropriate button would read the first card in the card reader into memory (op code 70), starting at address 400 and then jump to 400 to begin executing the program on that card.

IBM’s competitors also offered single button program load.

The CDC 6600 (c. 1964) had a dead start panel with 144 toggle switches; the dead start switch entered 12 words from the toggle switches to the memory of peripheral processor (PP) 0 and initiated the load sequence. PP 0 loaded the necessary code into its own memory and then initialized the other PPs.

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