Copy boot directory to mirrored partitions
Run the script 5.make_boot_mirror.sh from a root terminal.
Now the boot directory (/) is copied to the mirrored device,
available as mountable device /dev/md0.
Make initial Ram filesystem
Run the script 6.build_ramfs.sh.
Now the new boot partition (/dev/md0) is
made bootable, by creating an initial Ram filesystem to boot from,
and corresponding menu items.