# How to copy rootfs in that NX-emmc witch boot up form SDMMC3

**URL:** <https://forums.developer.nvidia.com/t/how-to-copy-rootfs-in-that-nx-emmc-witch-boot-up-form-sdmmc3/186451>\
**Category:** Jetson Xavier NX\
**Tags:** boot\
**Created:** [August 13, 2021, 6:17am UTC](https://forums.developer.nvidia.com/t/how-to-copy-rootfs-in-that-nx-emmc-witch-boot-up-form-sdmmc3/186451 "2021-08-13T06:17:09Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![chenglong.jiang108](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@chenglong.jiang108](https://forums.developer.nvidia.com/u/chenglong.jiang108)\
**Post date:** [August 13, 2021, 6:17am UTC](https://forums.developer.nvidia.com/t/how-to-copy-rootfs-in-that-nx-emmc-witch-boot-up-form-sdmmc3/186451/1 "2021-08-13T06:17:09Z")

</div>

hi，  
We have some questions about the use of sdmmc3, hope you can provide some guidance.

Now, we have successfully enabled sdmmc3 in Jeston Xavier NX emmc. It can be I/O or used as rootfs.We used this approach in the forum.

> [How to Boot From SD Card? - #17 by carolyuu](https://forums.developer.nvidia.com/t/how-to-boot-from-sd-card/67775/17)

> [@How to Boot From SD Card?](https://forums.developer.nvidia.com/t/how-to-boot-from-sd-card/67775/17):
>
> Hi hijikata\_M,
> 
> I can boot up from SD card, list steps for you reference:
> 
> ```auto
> $ sudo mkfs.ext4 /dev/sd<port><device_number> #Format your device with an Ext4 file system
> $ cd Linux_for_Tegra/rootfs/
> $ sudo cp -a * <mntpoint> && sync
> $ Unmount the disk and connect it to the target Tegra device
> $ sudo ./flash.sh jetson-xavier mmcblk1p1
> 
> ```
> 
> Please check your sdcard format or try to format and copy again.  
> Thanks!

Although it is working now, we still have some questions about it：

1. Can we copy the content in the SDCARD that has been used to get a SDCARD with the same content? And bootup from this new SDCARD? .We have tried to copy a used rootfs to another card through the command “sudo cp -a \* && sync”. Unfortunately this doesn’t work.  
We hope to make an image file containing some software, and it can be copied to more SDCARDs to boot NX.Can you give some suggestions?

2. You seem to mention in the forum that external storage cannot be upgraded via OTA

> [Boot from external drive](https://forums.developer.nvidia.com/t/boot-from-external-drive/182883)

> [@Boot from external drive](https://forums.developer.nvidia.com/t/boot-from-external-drive/182883/1):
>
> **6. Official OTA upgrade does not support boot from external**  
> Your “boot from external” setting would be gone after you try the apt upgrade. Because our OTA debian package by default only supports the boot from default path (emmc/sd).

Can this problem be avoided ?

---

<div class="post-metadata">

**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [August 13, 2021, 6:58am UTC](https://forums.developer.nvidia.com/t/how-to-copy-rootfs-in-that-nx-emmc-witch-boot-up-form-sdmmc3/186451/3 "2021-08-13T06:58:46Z")

</div>

1. Please refer to

> [How to create a distributable image of a SD card for Jetson Nano](https://forums.developer.nvidia.com/t/how-to-create-a-distributable-image-of-a-sd-card-for-jetson-nano/176916)

1. Actually, this question is a little lacking of thinking. “Official” OTA upgrade does not know your board design. Using it to upgrade the system will break your system. For example, your sdmmc3 will be gone. No need to think about mounting from it, since it does not exist.  
Official OTA upgrade is just a template. The correct way is you should study some knowledge of debian package and create your own debian package, put it on your OTA server and use it to update the system instead of using the official one.

---

<div class="post-metadata">

**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [October 17, 2021, 6:51am UTC](https://forums.developer.nvidia.com/t/how-to-copy-rootfs-in-that-nx-emmc-witch-boot-up-form-sdmmc3/186451/5 "2021-10-17T06:51:30Z")

</div>

Closed on October 17, 2021, 6:51am UTC

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.