Here I was expecting another small project and instead this post delivers in spades. Awesome to see svd2rust, there's definitely a couple edge cases(global #define) that bindgen doesn't quite cleanly handle yet and that's a clean solution to it.
This is a deluxe environment, with a debugger built in.
In the next episode, they add a CPU dispatcher.
BTW, regarding ESP8266 
Re: RTL8710... That was me! :) I haven't had much chance to continue hacking on the RTL8710 (we just moved, hobbies are still packed away) but I was pleasantly surprised how easy it was to get up and running.
Especially considering how little I know about embedded development, I imagine someone with more knowledge would be a lot more productive.
I worked on getting rust to run on an arm core a few years ago, and the process was honestly pretty miserable. This is so far ahead from what I had going, it is hardly comparable. Looks like a very streamlined and elegant process. Excellent work.