How can NX boot from SSD disk without using SD card

I have an NX development kit.
I want to boot the system through SSD hard disk, so that I can not plug in SD card on NX

Please refer to this page.

https://docs.nvidia.com/jetson/l4t/index.html#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/flashing.html#

Sdcard is still needed.

Ok, thank you.