Question

How is GRUB related to the bootstrap program?

Answer 1

Answer)
GRUB or better known as the GNU GRUB is the program is the boot loader which is used in the computer for users to have more than one operating system and is a multiboot specification. The GRUB is used as the program to choose the OS which runs when the computer starts. When the computer is on in the initial startup phase, the computer BIOS finds the primary bootable device which is generally the computer disk, then loads the initial bootstrap program from the MBR.

Here the MBR is the one which contains the GRUB Stage 1, Stage 1 then loads Stage 1.5 or Stage 2 directly. On the selection of the boot OS, the GRUB is used for loading the selected OS kernel on the memory of the computer and then pass the control from there to the kernel. Thus GRUB is related to the bootstrap program directly in the above processing of multi-boot systems.

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