I tested it again. Same result. But the rockpi4 image boots my rockpro64. But on both boards there is no video output. Now I found that there is a rockpro64v2 DTB and my board is a V2.
And there seems to be a better DTB for the V1.4 rockpi. Where is the setting which DTB to use. Is there a chart where the things are stored? It is anoying searching the information if one does not know what to search for.
