Download the Coverity Scan Self-build from https://scan.coverity.com/download/ and untar it.
You will need to configure ARM-NON-EABI- Compiler for it to use:
Configure
cov-configure --template --compiler arm-none-eabi-gcc --comptype gcc
If it's in a unusual location:
cov-configure --comptype gcc --compiler /opt/devkitpro/devkitARM/bin/arm-none-eabi-gcc
Run it
cov-build --dir cov-int make all
Make a tarball
tar czvf proxmark3.tgz cov-int
Upload it to scan.coverity.com