I installed DietPi_v140_NanoPiNEO-armv7-(Jessie).img on my Nanopi Neo and it works quite well. Now I want to write a kernel module to support a keypad which is connected to some gpio pins (access via /sys/class/gpio/ is already working). But for building kernel modules I miss the headers for kernel 4.9.0-sun8i.
I would expect that package linux-headers-dev-sun8i would provide the headers but it contains only something for kernel 4.8.3-sun8i.
For kernel 4.9.0-sun8i there seems to be no fitting package.
Thanks for your suggestions!