Title: Workaround for an OpenBSD boot error on APU boards
       Author: Solène
       Date: 10 September 2021
       Tags: openbsd apu
       Description: 
       
       If you ever get your hands on an APU board from PCEngines and that you
       have an issue like this when trying to boot OpenBSD:
       
       ```error message at boot
       Entry point at 0xffffffff8100100
       ```
       
       There is a simple solution explained by Mischa on the misc@openbsd.org
       mailing list in 2020.
       
 (HTM) Re: Can't install OpenBSD 6.6 on apu4d4
       
       I'll copy the reply here in case the archives get lost.  When you get
       the OpenBSD boot prompt, type the following commands to tell about the
       serial port.
       
       ```boot commands
       stty com0 115200
       set tty com0
       boot
       ```
       
       And you are done!  During the installation process you will be asked
       about serial devices to use but the default offered will match what you
       set at boot.