I have followed all the steps mentioned on the below link
I didn't face any errors or warnings while folllowing those steps. Once I tried to boot from SD Card, U-boot is searching for uEnv.txt. After that, it is displaying Invalid Partition 4, Invalid Partition 5, Invalid Partition 6, Invalid Partition 7. And it is not starting the kernel.
I have gone through the same page for different boards and in some of them, SD card partition steps are having some additional steps and changes. Did I miss something here?