I’ve played around with FreeBSD before and have a WiFi dongle from when I put it on an RPI. I have an old X220 for these type of experiments, but I appreciate the warning
OpenBSD runs fine on my X220i, and its Intel WiFi (iwn) is supported. But, the firmware has to be downloaded separately, so you either have to copy the firmware onto a USB drive and run fw_update after installation, or plug in Ethernet before installing, and it'll download the firmware automatically after the first boot.
