overscan and /boot/config.txt

[derdon222]

Hello forum members,

I am just trying to build an unplugable kiosk-like info screen based on a raspberry pi 2. So I am running it on piCore-6.1_v7-X image. I managed to automatically establish the wifi connection, and start the browser (kind of - will try to sort that with a second post). I have the problem left, that there are black borders around the screen - by default the pi seems to be set to overscan.
Normally I would try to change that in /boot/config.tct or with raspi-config but on PiCore I can not find any of those.
Some help would be great!

Thanks for reading this.

Best regards,

der Don

[bmarkus]

Mount /dev/mmcblk0p1 partition. It is the boot partition with config.txt, cmdline.txt, kernel, etc. but unmounted by the system to protect it after booting.

[pq5190362]

there are black borders around the screen - by default the pi seems to be set to overscan.

Black borders around the picture means underscan. Not overscan.

Overscan = cropped picture

Underscan = black borders around the picture (to compensate TV overscan for example)

So, what you are looking at is underscan, not overscan.

Regards