Hi, I tried it with the new " 5.1.16-cubox #5.90 SMP Sun Jul 7 11:37:47 CEST 2019 armv7l GNU/Linux" kernel, but still the same problem.
I also tried to build the module with dkms with the wireguard package from debian sid, but the build fails. Here is the logfile of the build.
DKMS make.log for wireguard-0.0.20190702 for kernel 5.1.16-cubox (armv7l)
Wed Jul 10 23:21:13 CEST 2019
make: Entering directory '/usr/src/linux-headers-5.1.16-cubox'
CC [M] /var/lib/dkms/wireguard/0.0.20190702/build/main.o
CC [M] /var/