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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. Probably the command find /vmlinuz or similar can help you (see section find).
2. Load the kernel:

   grub> kernel /vmlinuz root=/dev/hda1
   

   If you need to specify some kernel parameters, just append them to the command. For example, to set @option{vga} to `ext', do this:

   grub> kernel /vmlinuz root=/dev/hda1 vga=ext
   

   See the documentation in the Linux source tree for the complete information on the available options.
3. If you use an initrd, execute the command @command{initrd} (see section initrd) after @command{kernel}:

   grub> initrd /initrd
   

4. Finally, run the command @command{boot} (see section boot).

Caution: If you use an initrd and specify the `mem=' option to the kernel, to let it use less than actual memory size, you will also have to specify the same memory size to GRUB. To let GRUB know the size, run the command @command{uppermem} before loading the kernel. See section uppermem, for more information.

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