For the boot load via Uart iam not using cube programmer  , iam using FT232RL USB to TTL from a host i have uploaded the files to an SD card.* I Think my next step would be to remove cpu@1 & Gpu from the stm32mp157dk2 ,  files and re-try it . Regards...

Hello PatrickF,Thank you for the revert.* For the process to boot Stm32mp151fac1 , via UART , we have followed the SD partition as per the link mentioned , and , we used yocto project and in this we have used stm32mp157f-dk2's files and haven't adapt...