The OV5640 has been updated to work on M64 ( https://github.com/avafinger/ov5640/tree/A64 ) and will be included on next Armbian release (M2P).
Another thing to point to is that the guy Paulo Assis should not use mainline kernel (Armbian), he should get Armbian Legacy kernel that has good support for the Wifi and it really is working good on that. (Ubuntu 14.04).
We will update the ov5640 instructions on Armbian as soon as it get stable, and will be really soon.
from Alex of camera developer., thank Alex do this cool work.