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.

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.