Your computer and all of its hardware are built on standards. For the most part, they are adhered to by hardware and BIOS manufacturers. GRUB et al are just abstracting those away because they're obtuse and not very ergonomic to work with from day to day.
Your computer and all of its hardware are built on standards. For the most part, they are adhered to by hardware and BIOS manufacturers. GRUB et al are just abstracting those away because they're obtuse and not very ergonomic to work with from day to day.