You have to compile the headers from the source - basic instructions are here: http://wiki.friendlyarm.com/wiki/index.php/NanoPi_M4#Make_Your_Own_OS_Image I think I did make ARCH=arm64 nanopi4-images headers_install deb-pkg from a PC running ubuntu then installed the .deb on my NanoPi-M4. A couple o...
This worked for me -
http://wiki.friendlyarm.com/wiki/index.php/SPI