Important message for Apple Silicon OpenBSD/arm64 users

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As you may be aware, OpenBSD runs on Apple Silicon M series processors, thanks to the efforts of the OpenBSD/arm64 developers.

For those running our favorite operating system alongside the Apple product, sometimes special measures are needed, though.

Mark Kettenis (kettenis@) sent a message titled Important message for Apple Silicon OpenBSD/arm64 users to the misc@ and arm@ mailing lists, warning about possible firmware issues: 

Subject:    Important message for Apple Silicon OpenBSD/arm64 users
From:       Mark Kettenis <mark.kettenis () xs4all ! nl>
Date:       2024-05-21 20:54:21

As indicated here:

  https://social.treehouse.systems/@AsahiLinux/112449204541186432

The system firmware that comes with macOS Sonoma 14.5 triggers a bug
in the m1n1 bootloader that is used to boot OpenBSD on these machines.
The bug will prevent OpenBSD from booting on some machines after the
macOS update has been installed.  The recommended fix is to update the
"stage1" m1n1 by booting into macOS and running:

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