[Bug 264574] FreeBSD-13.1 mountroot error 19 on Raspberry PI 4 UEFI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264574

            Bug ID: 264574
           Summary: FreeBSD-13.1 mountroot error 19 on Raspberry PI 4 UEFI
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: neukam-bugreport@gmx.de

Created attachment 234582
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234582&action=edit
This file is the putty output from the serial console while booting the
raspberry

Hello,

I am experiencing a "Mounting from ufs:/dev/ufs/FreeBSD_Install failed with
error 19." error on a raspberry pi 4 compute module board, when I boot into
https://github.com/pftf/RPi4 and from there boot the
FreeBSD-13.1-RELEASE-arm64-aarch64-memstick.img image.

It does not matter, whether the UEFI is on the integrated emmc or an sdcard or
on a usb thumb drive, the error occurs. It does not matter whether the memstick
image is on the emmc or an sdcard or an usb drive either.

I checked the following bug:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239876 but unlike this one,
my "List of GEOM managed disk devices:" is empty. Which I guess may be part of
the problem.

I have referenced this problem here: https://github.com/pftf/RPi4/issues/219
because I am not sure whether this may be due to an error in the UEFI
implementation or Freebsd or a combination of both.

The RPI image of Freebsd 13.1 works without a problem, it is just the memstick
version that doesn't work. (I did not use the RPI image together with UEFI, but
on its own)

I have seen the same behaviour with 13.0

I hope someone has an idea how this can be fixed.

kind regards

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