I’ll answer a couple of things before rebooting.
Standard underline cursor, it does nothing but blink. It is normal on my system to show up immediately after the BIOS “welcome” screen goes away and it hands control over to try to load the boot sector.
I’ve never ever run the bootcode param, nor actually manually run gpart in this O/S. (It’s not that old that I don’t know what I’ve done since I got it. : )