While Unity runs on a variety of embedded system configurations, not every possible configuration is verified and continuously tested.
There are two categories of embedded configurations we verify, test and support. Project-specific ones with customized operating systems (naturally, we can’t share those) and a set of “default” configurations using publicly available hardware and BSPs.
While the first category requires embedded Full support, the latter can be supported through Basic embedded support and the list of those “open” verified platforms is now live as part of the documentation!
Since the list may differ between Unity versions, you may use the version picker to view the list for your particular version.