No need to worry about How to remove SD card from board, how to program my binary in it or U-Boot is running from non-removable SPI memory, etc. Just use
>loadb -> Just load your binary format executable through Kernmit -> send
>loady -> Load your binary through Y-modem
>loads -> Load your S3 record format exeuctable
>go <Load Address>
>loadb -> Just load your binary format executable through Kernmit -> send
>loady -> Load your binary through Y-modem
>loads -> Load your S3 record format exeuctable
>go <Load Address>