Also, has a public version of the MT7981 Reference Manual been published? Google only finds me a pirated partial copy on Scribd. This will be needed to get all the memory locations for the DTS file, otherwise we will need to steal them from the DTS files in the Mediatek SDK or OpenWRT.
Banana Pi released a public version of the MT7986 manual which has all the various register memory locations documented, though some stuff is missing.