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Date:      Sun, 6 Oct 2024 14:35:15 +0200
From:      Stefan Hegnauer <stefan.hegnauer@gmx.ch>
To:        freebsd-stable@freebsd.org
Subject:   APU1 bricked on stable/14 - solved
Message-ID:  <feaff803-ae93-4e9b-a8e6-1498d7b07b69@gmx.ch>

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I have a few pc-engines APU1 appliances running in headless mode under
Nanobsd. Maintenance is by means of=C2=A0 direct COM port connection.
After a recent update a few weeks back I was not able to connect by COM
port anymore - console output and input went away after booting and
before single- or multi-user mode would start. Even re-flashing the
SDcard with a fresh image did not help.

After some longish trials and errors it turned out that both
- commit 74b9fc7a 'amd64 GENERIC: Switch uart hints from "isa" to
"acpi"' as well as
- commit 4ba4cfaf 'acpi: Narrow workaround for broken interrupt settings
on x86'
broke things for me. Restoring hints and setting
hw.acpi.override_isa_irq_polarity=3D1 in /boot/loader.conf.local restored
working order.

I agree that APU1 is EOL, however I would have expected an entry to
UPDATING for such a POLA violation.

Note that pc-engines APU2 models are not affected as the BIOS ACPI
tables contain correct UART descriptions.

- Stefan



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