How to see boot messages on uart

I can connect at 115200 serial wit a CP2102, but only get standard login. Is there a way see boot messages and control boot with it?

without knowing which board or OS, here’s a guess
in “/boot/uEnv.txt” there is a string that starts with “cmdline” in this line remove the word “quiet” save the file and reboot.
hope this helps,

Thanks. Beagle Play was left out.

Found in

remove ‘quiet’ from /boot/firmware/extlinux/extinux.conf
this is the location that is used at boot time.
i didn’t buy the Beagle Play, messing with BeagleV-aHead, has it’s own challenges,