The datasheet describes how to connect a 4 lane camera onto two CSI x2 lane inputs. My question is, can a 4 lane camera be used on CSI inputs CSI0 and CSI2 as a 4 lane camera Input? Looking at development kit carrier board and it only has inputs for CSI0 and CSI2, so is the development kit unable to use a 4 lane camera?
No. The lane mappings are listed in product design guide, please refer to that and not violate.