During the build of my image, I want to add my files like:
etc/config/wireless
etc/config/network etc, ....
to my image directory, I have created a folder named files/etc/config/... then I used the command: make V=99 FILES=files/ to create the image file.
But I had an annoying error: ERROR: module 'files/' is missing., then the compiling process halted.
You don't need to pass FILES=files/ to make in the buildroot, the files/ directory is used by default if it exists. You only need to specify make ... FILES=files/ when using the ImageBuilder.