SLES12 update using zypper. Reboot system and lost first boot menu.
Ran mkinitrd and zipl but menu did not return although messages stated they were rebuilt!
Executed:
grub2-mkconfig -o /boot/grub2/grub.cfg
grub2-zipl-setup

Using config file '/boot/zipl/config' (from command line)
Building bootmap in '/boot/zipl'
Building menu 'menu'
Adding #1: IPL section 'grub2' (default)
Adding #2: IPL section 'skip-grub2'
Preparing boot device: dasdf (15c0).
Done.