Is it possible to show boot log or info on a character LCD that the Raspberry Pi is still booting?
I'm using a generic 16x2 character LCD
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You could create a simple python script that runs on startup with Cron. That script would display whatever you want for a small amount of time and then end. This would effectively tell you when your Pi's done with booting or if it still is.
You can enter this to edit crontab:
crontab -e. Select Nano or any editor you're comfortable with and add a line like this:
@reboot python3 /home/pi/your_script.py. I recommend you read the documentation for Cron if you haven't used it before: https://www.raspberrypi.org/documentation/linux/usage/cron.md.
Edit: If you want it to be on during startup and off once booting is over, you could use a transistor to create an inverter (NOT Gate).