There's the readme on GitHub showing you what you have to do for a new board, but there's not a step by step tutorial that'll walk you through the process - you'll have to get stuck in. However it looks to me like it has already been ported. All you'd have to do is compile your own version.
I don't think the extra RAM or display is supported out of the box though.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There's the readme on GitHub showing you what you have to do for a new board, but there's not a step by step tutorial that'll walk you through the process - you'll have to get stuck in. However it looks to me like it has already been ported. All you'd have to do is compile your own version.
I don't think the extra RAM or display is supported out of the box though.