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5.4.2 GNU/Linux

It is relatively easy to boot GNU/Linux from GRUB, because it somewhat resembles to boot a Multiboot-compliant OS.

  1. Set GRUB’s root device to the same drive as GNU/Linux’s. The command search --set=root --file /vmlinuz or similar may help you (see search).
  2. Load the kernel using the command linux (see linux):
    grub> linux /vmlinuz root=/dev/sda1

    If you need to specify some kernel parameters, just append them to the command. For example, to set acpi to ‘off’, do this:

    grub> linux /vmlinuz root=/dev/sda1 acpi=off

    See the documentation in the Linux source tree for complete information on the available options.

    With linux GRUB uses 32-bit protocol. Some BIOS services like APM or EDD aren’t available with this protocol. In this case you need to use linux16

    grub> linux16 /vmlinuz root=/dev/sda1 acpi=off
  3. If you use an initrd, execute the command initrd (see initrd) after linux:
    grub> initrd /initrd

    If you used linux16 you need to use initrd16:

    grub> initrd16 /initrd
  4. Finally, run the command boot (see boot).