Hi all! I’ve seen a few posts on this topic, but none of them provided quite what I want, so here’s a new post.
Background: I have a device connected to the Pi4’s UART pins (14, 15). When the Pi boots, uBoot messages/Linux login console show up on the UART bus. This floods the UART buffer in my connected device and locks it up. I’m using a development image of BalenaOS, and I need a fix to work on development and production images.
I need a way to completely disable any boot messages on the UART at pins 14/15 port OR I need to move the boot/console to a different UART port, but I still need access to that UART (pins 14/15) from my software. I would also really like this solution to not require booting into linux if possible. I want to be able to just add some configuration to cmdline.txt/config.txt/uEnv.txt so I can just edit a built image and distribute it pre-configured.
Is this possible?