As you need to implement your solution into Android system, you end up learning a lot about the different Android layers (kernel, OS and applications) and how to integrate them. I decided to add the following list with some tips, as these small things took me some precious time to get it solved. The list will be often edited:
#01 - Make sure that you're flashing the device with the proper kernel image
This is what happened to me: I had previously built the kernel (something like two months before). Then, I had to build the OS image from scratch, that is, cleaning up the previous build (with make clobber). When I used the command make bootimage, including setting the variables properly, the output always had the wrong kernel image (not the one that I had previously built, but the existing one in the directory prebuilts). The build process won't take too old kernel images. Therefore, make sure that the compressed kernel image is always new. Even if you don't make any change on the kernel source, do make again to generate a new file.
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