FreeBSD
From linux-sunxi.org
Allwinner SoC support is in FreeBSD-CURRENT and FreeBSD-12 tree.
Some official images are prebuilt for some boards and can be found on download.freebsd.org:
- https://download.freebsd.org/ftp/snapshots/ISO-IMAGES/13.0/ - https://download.freebsd.org/ftp/releases/ISO-IMAGES/12.0/
For more information like supported boards and SoC, please refer to https://wiki.freebsd.org/FreeBSD/arm/Allwinner