Boot
Boot is the process of operational system start-up on a given machine. It is accomplished with the aid of a special app named boot-loader that is responsible for loading the OS kernel and other components when it is invoked by BIOS. While boot-loaders are commonly shipped with a number of operational systems themselves, the Arch distribution of Linux lacks any and requires its users to manually install it. [1, 5-6] Booting is almost exclusively programmed with the C programming language and Assembly.
Different manufacturers implement different hardware specifications and booting mechanisms, which are reflected in the appropriate software varying per instance. Boot-loaders must use as little memory space as possible, and multiple brands leave out extremely little space, often sheer kilobytes or even bytes. Other times boot-loaders may expect certain behaviour from ACPI tables and BIOS settings, but if their standard would not be implemented entirely, this may raise ACPI errors during booting and may prevent machine from booting.
The LINUX/x64 Boot Protocol. Linux official documentation. Retrieved from: https://www.kernel.org/doc/Documentation/x86/boot.txt
Compaq Computer Corporation Phoenix Technologies Ltd, Intel Corporation. (1996). BIOS Boot Specification 1.01. Retrieved from: https://acpica.org/sites/acpica/files/specsbbs101.pdf