My friends are working with LEDE core developers to add MT7623/BPI-R2 support into LEDE official branch. If anyone wants to build his own LEDE FW, please get code from
Comparing to current LEDE official branch, it contains some upstream back-port drivers and bugfix. feel free to give your feedback if you find any issues, thanks.
The tree seems to support quashfs on emmc with block2mtd, and I also plugged into all cards into all slots available on the board appearing to that lsusb, lspci can find them out as well, including the sata IDE controller with ASMedia.