How to change the rootfs to boot from another partition

Autonomous Machines Jetson & Embedded Systems Jetson Xavier NX
1

Hello everyone , I use the hardware is Jetson Xavier NX, Jetpack 4.5.1.
I want make the 300M RCMROOTFS into real ubuntu rootfs which boot from.
My steps are:

  1. Created a minimum ubuntu rootfs system, ubunt.tbz2
  2. mkfs.ext4 /dev/mmcblk0p10
    mount /dev/mmcblk0p10 /mnt
  3. copy the ubunt.tbz2 to Tegra device
  4. tar -vxjf ubunt.tbz2 -C /mnt
  5. modify the Tegra device file /boot/extlinux/extlinux.conf
    root=/dev/mmcblk0p10

However when I reboot, there is a Kernel panic - not syncing: Attempted to kill init! exitcode=0x00007f00
boot.log (25.7 KB)
what’s wrong with it?
My fundamental goal is to create a file system for upgrading the image of partition mmcblk0p1.
Is there any other better way?
Due to some reasons, I can’t upgrade jetpack 4.5.1 to 4.6.
Thanks

3

Hi kite.wang,

To update Jetpack, you can just refer to the instruction of Updating a Jetson Device with apt command.
You don’t need to partition, format, copy contents of rootfs by yourself.

6

Thankyou KevinFFF
However I actually want to use the partition RECROOTFS as a emergency rescue system, when the APP /dev/mmcblk0p1 is fault, it can boot from RECROOTFS. How can achieve it?

7

It seems you could refer to the following instruction for redundant rootfs.
How to Create Redundant Root File Systems

8

NO, I already mentioned earlier that I need to use jetpack4.5.1,insted of jetpack 4.6

9

Does the following command work on your board?

$ sudo ROOTFS_AB=1 ./flash.sh  jetson-xavier-nx-devkit-emmc mmcblk0p1
10

Thanks KevinFFF
Now I have the A/B partition, I would like to know where nvbootctrl controls the boot partition by modifying it

11

You could use the following command to check current slot status of rootfs.

$sudo nvbootctrl -t rootfs dump-slots-info

If current active slot is slotA, you could use the following command switch to slotB.

$sudo nvbootctrl set-active-boot-slot 1
13

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