I followed the steps in the below link for booting from the external device.
I used SSD as the external device.
Initially flashed the image to emmc and then downloaded the rootfs and copied to SSD. Then copied the PARTUUID into the bootloader/l4t-rootfs-uuid.txt file. I was able to flash the rootfs from SSD as mentioned. And the board booted up perfectly.
But for me the requirement is to boot from the SSD directly for the first time itself.
Is it possible to do in that way?
If so, could you please mention the steps for doing it.
Ann Rose Antony.