Here is solution:
From r32.6 add the NVME to boot option, This document described how to change boot order when flashing system.
1. Find the cbo.dts in /bootloader to change the boot-order property if ‘nvme’ is already there to something like 'boot-order = “sd”, “usb”, “emmc”, “net”, “nvme”; and save the new cbo.dts.
2. Then compile it with dtc to create a ‘cbo.dtb’, and place that in /bootloader/ and flash the system to apply it.