loader.conf and rootdev option for memory disk

Hi all,

In the /boot/defaults/loader.conf are these options for memory disk settings:

#mdroot_load="YES"              # The "mdroot" prefix is arbitrary.
#mdroot_type="md_image"         # Create md(4) disk at boot.
#mdroot_name="/boot/root.img"   # Path to a file containing the image.
#rootdev="ufs:/dev/md0"         # Set the root filesystem to md(4) device.


But - is this example for rootdev option still right? Because “ufs:/dev/md0” works fine on freebsd 12.1, but on freebsd 12.3 this does not work and generates error message:

Can’t determine root device


When I use this option with value “/dev/md0” or “md0” (even with this option commented out), so the machine boots correctly without any error.

—
Mira