Polarian, I have never attempted this but maybe it will help? You cold rule out the pi being the issue. https://amitasinghchauhan.medium.com/serial-port-debugging-101-loopback-test-4a7e40da9055
Looks like you can do a loopback on the adapter too. https://kb.plugable.com/serial-adapter/troubleshooting-how-to-perform-a-loopback-test Reese KN4NTU On Mon, Aug 04, 2025 at 10:01:50PM +0100, Polarian wrote: > Good evening, > > I have setup OpenBSD over serial on many RPI's in the past, but tonight > I have been having a really bad time. > > I use a ch341 which has worked for me in the past, I have checked my > pinout many MANY times, I have tried cu on FreeBSD, and tio on Arch > Linux but the same issue keeps occurring. Baud-rate has been set to > 115200 OpenBSD side in /etc/boot.conf as it was having issues with the > default 9600 (text was gibberish despite both sides being 9600). > > So serial works, rx is fine I can read the output and I get the login > prompt, but tx is not working, I don't think its just openbsd as it > doesn't appear to be working in the bootloader either. Its not the > biggest deal as I can set the tty to fb0 and use a monitor and > keyboard, but carrying around a monitor and keyboard and copying text > over from my laptop is not ideal. > > I believe my adapter could potentially be broken, as like I said its > worked flawlessly in the past. Just in case I have made a stupid > mistake I am posting here, if anyone has any suggestions let me know. > > Apologies for the noise. > > Take care, > -- > Polarian > Jabber/XMPP: polar...@icebound.dev >
