As far as I'm aware there is no RPC facility for eCos, but that's not to say that no one is working on it, or that it's not available from some third party location.
If no one can help you here, then general eCos questions like this can be posted to the ecos mailing lists (
http://ecos.sourceware.org/intouch.html). That will put you in touch with a wider group of eCos developers.
