Use the ROMFS for a filesystem (should be good for some 20Kb above the
alternatives). Pull the virtual console support out (or use just one
VT).
Check what you are running in userland; perhaps change to a leaner shell
(like ash) or just launch a statically compiled program as init that does
everything you need directly via fork()/exec()ing the relevant programs. In
the programs themselves get rid of stuff like internationalization, help
and error messages, ... I'd guess the userland fat is far larger than what
you can gain out of the kernel. And more portable to remove, too: The
kernel is lean as they come; the userland stuff is configured for
flexibility, not minimal size.
Have fun!
-- Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl Departamento de Informatica Fono: +56 32 654431 Universidad Tecnica Federico Santa Maria +56 32 654239 Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513