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Many A20 features are in mainline kernels now, although sunxi-3.4 is still recommended for full hardware support.

http://linux-sunxi.org/Linux_mainlining_effort#Status_Matrix

EDIT: The GR8 is specifically called out on this page as having mainline support from kernel 4.9.

I've been running bananian with the 4.4 kernel on my bpi-R1 (A20 SoC) and everything seems to be working fine. Although I don't use it for anything graphical (it's a networking/storage/server device.) Can't say how much it's relying on binary blobs though.

Sadly Allwinner did zero of that mainlining.

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