We offer SUB Kit Nano, an alternative upgraded vesion of NVIDA Jetson Nano.
You can boot SUB Nano Kit from onboard 16G eMMC. But some want to boot from SD card in order to expand larger storage.
Here is the user guide for reference.
Google Drive: Sub Kit Nano Flash Process.pdf - Google Drive
This article introduces how to make an image that can be started from emmc and
boot method from TF card under jetpack4.6, if you want to boot from eMMC then just focus on the first part
What is /dev/mvmeon1p1/?
Is it a partition on the TF card? In the photo, the tf card partition seems to be mmcblk1p1 so I am unsure where mvmeon1p1 is coming from