Trough this way i would like to discuss the best option to support the Connect Tech Photon board. Because Connect Tech provides BSP sources this would be a fairly straightforward job by patching linux-tegra-4.9. This is the approach we took for our own Yocto distribution and could work for Balena as well.
One of the reasons we choose for the Photon carrier board is that it both supports Nano & NX. Although NX will be supported from JetPack 4.4 onwards it also requires it’s own BSP for Photon which has to be released by Connect Tech.
Basically this means we need to add following MACHINE (photon-nano, photon-nx) to balena-jetson in which the photon-nano can be supported allready.
If you agree with the above we could prepare a PR. Basically it’s a decision by either providing DTB directly or compile from source.