OpenBSD FDE Setup
       This is a condensed version of OpenBSD FDE encryption FAQ.
       Boot installer, drop to shell with "s"
         # cd /dev && sh MAKEDEV sd0
         # dd if=/dev/urandom of=/dev/rsd0c bs=1m
         # fdisk -iy -g -b 960 sd0 # GPT / without -g and -b for MBR
         # disklabel -E sd0
       Note, switch to kbd en before setting the password as this is
       what you have on the boot prompt.
         # bioctl -c C -l sd0a softraid0
         # dd if=/dev/zero of=/dev/rsd1c bs=1m count=1
       Ctrl+D to restart the installer. Choose sd1 as install target.
       If sd1 is not present:
           # cd /dev && sh MAKEDEV sd1
       When the installer later asks about installing with MBR or GPT layout, 
       choose MBR. Even if you boot via UEFI/GPT.
       # Changelog:
       # * 2020-11-14: Created
       # * 2021-04-18: Added MBR info for disk layout selection