FreeBSD currently uses 9600 bps as the default for serial communication -- in the boot loader, kernel serial console, /etc/ttys, and so on. This was consistent with most equipment in the 90s, when these defaults were established. Today 115200 bps seems to be much more common, and I'm proposing that we make it the default for FreeBSD 14.0.
I have a review open: https://reviews.freebsd.org/D36295. There are a few minor nits in the review to be addressed still but assuming there's general agreement I'll iterate on those and commit this in a few logical chunks.
