An Orange Pi R1+ LTS is on its way to me to replace the Orange Pi R1 that currently serves as my firewall (my fibre speed has increased and 100Mbps PHYs are too slow)
The board is similar to the Orange Pi R1+ except that a NIC has a different chipset.

Orange Pi R1+  LTS uses Rockchip rk3328 and has 1GB DDR3 memory and two 1 Gbps NICs.
Compared to the Orange Pi R1+, the Realtek RTL8211E PHY has been replaced with a YT8531C PHY.
The memory is also DDR3 vs DDR4.

Armbian has WIP images for the Orange Pi R1+, but not the Orange Pi R1+ LTS.  I guess that this could be a good starting point if I can figure out how to change the PHY.

On 12/11/2021 at 11:25 PM, schwar3kat said:

An Orange Pi R1+ LTS is on its way to me to replace the Orange Pi R1 that currently serves as my firewall

I've since become a maintainer for this board. 
I've added the new phy into the build, and it's working well for Linux-5.10y, Linux-5.15y and Linux-5.16y.