Comment # 17 on bug 1230345 from Ruediger Oertel

(that disk is normally not mounted at all and I only mount it to add a new
kernel/initrd pair and update zipl):

ssh $TARG "mkdir -p /boot2 ; mount
/dev/mapper/3600507630bffd2160000000000002000 /boot2"
scp $ENVI/kernel $TARG:/boot2/kernel-kiwi-$DAT
scp $ENVI/initrd.xz $TARG:/boot2/initrd-kiwi-$DAT.xz
ssh $TARG "sed -i -e 's@workers/[^/]*/@workers/$ENVI/@' /boot2/zipl.entry"
ssh $TARG "/boot2/gen_zipl_conf ; umount /boot2"

and /boot2/gen_zipl_conf generates the config and calls zipl:
...
cat /boot2/zipl.head /boot2/zipl.entries /boot2/zipl.bottom /boot2/zipl.menu >
/boot2/zipl.conf
zipl -c /boot2/zipl.conf