I had Emacs running as PID 1 inside of an initramfs roughly around 2010. Had a part of sysvinit reimplemented in Emacs Lisp, for things like ALSA and networkin

I had Emacs running as PID 1 inside of an initramfs roughly around 2010. Had a part of sysvinit reimplemented in Emacs Lisp, for things like ALSA and networking. Kernel + initramfs was roughly 200MB IIRC.