Thun sunxi family of chips is really badly supported by the manufacturers, but the mainlining effort (as documented at https://linux-sunxi.org/Linux_mainlining_

Thun sunxi family of chips is really badly supported by the manufacturers, but the mainlining effort (as documented at https://linux-sunxi.org/Linux_mainlining_effort https://linux-sunxi.org/Linux_mainlining_effort) is going pretty well. It's still a bit risky if you don't buy an entire integration package from one of the big vendors and at that point you're NDA'ed so hard you might as well go Broadcom or Qualcomm.