You might be interested in monitoring this list of what gets closest: https://www.fsf.org/resources/hw/single-board-computers
Also, the Novena mainboard has a chance of getting there, if you look at this page: https://www.kosagi.com/w/index.php?title=Novena_Main_Page and then note that the Vivante GPU is close to having free drivers: https://www.phoronix.com/scan.php?page=news_item&px=Etnaviv-...