$ cp /etc/mkinitcpio.d/linux.preset /etc/mkinitcpio.d/${feature}.preset
# update ${feature}.preset
# set ALL_kver field to kernel version
# set default_image field to /path/to/${feature}.img
$ mkinitcpio -p ${feature}
$ cp /path/to/${feature}.img /boot
$ grub-mkconfig -o grub.cfg
$ diff -y /boot/grub/grub.cfg grub.cfg