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For J721e we have 2 boot partitions. So basically we have A/B partition for bootloaders.
By default boot0 partition is used to boot from eMMC. To switch to boot1 partition we can use U-Boot environment variables & also to switch back and forth between boot0/1.
For rootfs there is no ready solution. You will have to manually create 2 rootfs partitions & store kernel images. You can switch between the 2 rootfs partitions using U-Boot bootargs.
