Since GNU/Hurd is Multiboot-compliant, it is easy to boot it; there is
nothing special about it. But do not forget that you have to specify a
root partition to the kernel.
- Set GRUB's root device to the same drive as GNU/Hurd's. Probably the
find /boot/gnumach or similar can help you
- Load the kernel and the module, like this:
grub> kernel /boot/gnumach root=hd0s1
grub> module /boot/serverboot
- Run the command boot (see boot).