Sunplus has rolled out several families (SP7020, SP7350, SP7355). Each adds a few extra registers. Fork the source, add a new “chip‑ID” case, and test on a dev board.
The Sunplus Loader Tool is a specialized Windows-based utility designed to communicate with satellite receivers using Sunplus processors (such as the 1506G, 1506TV, 1507G, and 1506F series). sunplus loader tool link