OPNSense startup issue with USB drive and fix

[open2bsafe]

After successful installation, I got the following error when rebooted:

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Mounting from ufs:/dev/da1p2 failed with error 19.

Loader variables:
  vfs.root.mountfrom=ufs:/dev/da1p2

Manual root filesystem specification:
  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:zroot/ROOT/default
        cd9660:/dev/cd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/cd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

I typed in ? and press enter, the following (among many others) are shown:

ada0p2
ada0p1
ada0


da0p2
da0p1
da0

I typed in: ufs:/dev/da0p2 and press enter and it started up.

It would be nice if this is fixed so I don't have to do this.  I am not sure if adding to /boot/loader.conf would work, but I can give it a try.

vfs.root.mountfrom="ufs:/dev/da0p2"

This does not happen with PfSense, but I would like to move my devices to OPNSense.

[open2bsafe]

I can confirm that once I log in and get into Shell, appending the /boot/loader.conf file as mentioned above works when restarted.  This is mentioned here.

https://forums.freebsd.org/threads/booting-from-usb-error-19.57429/#post-327585

So, I stumbled on the first boot after installation, and using "?" command to find out various partitions, and using it to manually enter: ufs:/dev/<partition name>

helps moving forward.