Where can I find the Android source code for the BPI-M2 Ultra?

Banana Pi SBCs design BPI-M2 Ultra / BPI-M2 Berry(A40i)
1

Where can I find the Android source code for the BPI-M2 Ultra?

The path below doesn’t seem to be the Android source.

2

please see here :

https://github.com/BPI-SINOVOIP/BPI-R40-V40-Android6