hi,arun_belamge
Thank you for your reply.
I have helped you to test the demo of Uart_Example_S32G399A_M7 in RTD 5.0.0, and apply it to use the QSPI mode on RDB3 board. It is the process as the below.
1.Built the demo of Uart and create the .bin file in S32DS IDE. I do not modify any more, just Update Code and Built it.
2. Create the Blob.bin file. You can refer to the configuration as the following picture.

3.Flash the blob.bin to Nor Flash and setting the hardware boot from QSPI, then open serial console to choose 9600 baterate, you can find the output information.

Hope this can help you.
BR
Joey