I'm not familiar with that package, but there have been several openbsd-misc threads about running on nothing but a CF card, particularly on constrained platfor

I'm not familiar with that package, but there have been several openbsd-misc threads about running on nothing but a CF card, particularly on constrained platforms like Soekris boards. That's probably a good starting point. I haven't put OpenBSD on a real "embedded" system, but I've installed it on stripped-down, ancient attic hardware over null modems. I don't doubt that it would scale down even further. It makes an incredibly dependable firewall.