This is exciting for quite a few boards and notebooks, notably the new Pinebook Pro (RK3399) and the Asus C201 (RK3288) both benefiting from the Panfrost driver.
Now with open 3D acceleration, the last remaining bit of proprietary code on the C201 is the WiFi chip. Not sure how much of an impact it'll have, but when Cypress bought Broadcom's wireless division it released the datasheet for this and many other chips (PDF): https://www.cypress.com/file/298141/download
Sadly it is hard to get a new C201PA these days? It is a 3 year old machine that has been discontinued.
But it is truly unique as you pointed out, it can be run almost binary blob free or totally free if you replace the wireless chip (simply plug in a tiny Atheros USB adapter).
But it is truly unique as you pointed out, it can be run almost binary blob free or totally free if you replace the wireless chip (simply plug in a tiny Atheros USB adapter).