I'm working on an Linux embedded system and I'm using NFS to test and make my trials. As boot device I'm using an SD card (eMMC as boot device is also possible). Since I arranged my SD Card to store both boot and filesystem to allow the system to work with the whole system on SD Card, I'd like to know what's the minimum requested on SD Card to boot in NFS mode. Does in NFS mode it's used uboot only from the SD Card? Kernel (ZImage) and DTB files are necessary on the SD Card used as boot device? And filesystem must be on the SD Card too?

Paolo