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are you booting from sdcard or NOR?
if you are booting from sdcard, please check the partitions of sdcard and "boot" partiton should be bootable. Please go through the below link to make sdcard bootable:
if you are booting from NOR, please follow below link to flash the images to NOR:
before this, if you are working on any project, better you need to setup the yocto first, for yocto setup, please go through the below link: