Is a boot loader divided into a plurality on each other constructive stages, it will be (as a multistage boot loader English multistage boot loader ), respectively. 3 bootloaders with additional functions.It contains basic initialization routines and often communication protocols to enable the exchange of application programs.Ī boot manager is a utility program that can be installed on an operating system, contains its own boot loader and offers extended configuration options. The bootloader cannot be reloaded there, but is located in the non-volatile memory of the control unit. īootloaders are also used in the area of embedded systems. On IBM PC-compatible computers with BIOS, this is always in the first block, block 0, which usually contains a master boot record (MBR) as a start program and as a partition table on partitioned data carriers.

Some older architectures load the boot loader from a predefined block of the bootable medium, which is therefore also known as the boot block or, more commonly, the boot sector. PE / COFF with UEFI, or the firmware implements a cross-architecture intermediate code format such as. On the one hand, this can be due to the processor architecture and in particular its instruction set, such as B. The boot loader itself must also be in a specific executable file format. This is the case, for example, with Open Firmware and UEFI, whereby the partition tables and file systems used can be different. On more modern architectures, it is usually located as a file on a file system supported by the firmware on a specific partition and is loaded and executed directly. Where the bootloader is located on the variable data memory and how it is loaded varies depending on the computer architecture and platform. The process of booting (running a program on a computer that is not yet running an operating system) is partly reminiscent of trying to pull yourself out of the mud by the loop of your own boot. The English term bootstrap originally refers to the loop that is located on the back of a boot to make it easier to put on the boot. The process itself is called booting (in German also start ) of a computer.

This is why we often talk about the boot code, the first program ( machine code ) that is loaded from a changeable changeable data memory after the unchangeable firmware. The boot loader then loads other parts of the operating system, usually a kernel. As UEFI, or legacy in compatible IBM PCs, the BIOS ) of a computer is loaded from a bootable medium and then executed. A boot loader (English pronunciation, from the shortened form of the original word bootstrap loader ), also launcher or boot loader called, is a special software, which is usually by the firmware z (.

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