The kernel is fetched from a sony copyleft archive, version 3.4.0. Display, touch and USB networking are working.
In essence, this is reopening #1180 @PureTryOut convinced me to merge this as a starter, it only needed to be updated to the latest devicenfo format. I might still try to port a more recent kernel, but I don't have much time right now...
I am not sure I can mirror the archive on GitHub. It's 142MB, and doesn't fit in a "release" post. Will it fit in a depot?