Hello
I have one copy of the board and I'm ready, if necessary, to test the LEDE on it.
But I'm not a very experienced Linux user and I understand almost nothing in programming (I can record an image and check the operation of the main functions)
Try
Mediatek (ARM)
as target
Sorry I don't have linux now. I can get shell acccess to bpi for developer.
Have you seen this post http://forum.banana-pi.org/t/banana-pi-bpi-r2-lede-openwrt-development-in-progress/3724/3
easy to buy banana pi BPI-R2 sample:
https://pt.aliexpress.com/store/product/Newest-arrive-Banana-PI-BPI-R2-Opensource-Router/302756_32823351577.html?spm=a2g03.12010612.0.0.7996dc24yTlKNx
Can I take the sample , free 
banana pi BPI-R2 wiki documents online, we will keep update this documents.
http://wiki.banana-pi.org/Banana_Pi_BPI-R2