There are many people that get in to a tangle just setting up TTS OS via the Docker using the instructions supplied and I’ve not seen any posts from anyone who’s gone direct or even compiled the source, so responses are likely to be limited.
I’d start out with running the Docker version so I can poke about to see how it links together. And then look at the Docker support files.
Or use a support ARM platform like a Raspberry Pi? If this isn’t possible, please tell us what is unique about your board with customised OS so we can make suggestions.