On first glance I could not find a Firmware Image to analyze on their site, and the tech-specs are lacking any useful information about the used SOC/Chipset.
Lacking those, we’d need a serial bootup log, and/or detailed pictures of the board.
Would you be willing to open yours, make some hidef pictures, attempt to locate the serial port, connect to it, and get us some boot logs?
To add some additional detail to @stragies comment, here is the information about how to add new device support:
This typically only happens when the person/people interested in said support are able and willing to contribute to the development process. At the very least, there is the first step of hardware discovery that is necessary to determine if support is even possible. The developer community will likely help guide you through the process, but since you're the one with interest and (theoreticaly) the device in hand, your participation will be key.