Jetson nano with Jetpack 4.6.1 still uses /boot from SD card

[abishekmuthian]

Describe the issue Jetson nano with Jetpack 4.6.1 still uses /boot from SDCARD after the copying the rootfs.

When the SDCARD is removed, It's struck in NVIDIA boot splash with SDCARD cross symbol(SDCARD missing).

If SDCARD is present, It uses the USB storage as root from the extlinux.conf from the /boot of SDCARD.

What version of L4T/JetPack L4T/JetPack version: 4.6.1

Which Jetson Jetson: Jetson Nano Developer Kit (4GB)

To Reproduce Steps to reproduce the behavior: Follow the procedure as per README.md

Expected behavior It is expected to use the /boot from the USB storage.

Additional context AFAIK Jetson's bootloader should be able to pickup the USB storage's /boot, but it's not and uses /boot from the SDCARD.