A/B ROOTFS Redundancy: After flashing the ROOTFS AB dual partition on the Orin NX board, the nvbootctrl cannot switch partitions

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin NX
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1

Hi Nvidia team,
I’m using Jetson Orin NX 16G, and after flashing the ROOTFS AB dual partition, I can’t switch slot by using nvbootctrl.
The command to flash:
sudo ROOTFS_AB=1 ./tools/kernel_flash/l4t_initrd_flash.sh --external-only --external-device nvme0n1 -S 110GiB -c ./tools/kernel_flash/flash_l4t_t234_nvme_rootfs_ab.xml --network usb0 jetson-orin-nano-devkit external
flash log:
flash_1-13_0_20250410-195449.log (31.7 KB)
After flashed the device, I try to use nvbootctrl to switch the slot but fail. The current slot and active is slot A,and I set active slot to B, but I dump-slots-info and find the active slot is still slot A. Can you provide some assistance? I would greatly appreciate it.
the command I ran after the device booted up.
sudo parted -l
[sudo] password for hihonor:
Model: aigo NVMe SSD P3000 512GB (nvme)
Disk /dev/nvme0n1: 512GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
3 20.5kB 134MB 134MB A_kernel msftdata
4 134MB 135MB 786kB A_kernel-dtb msftdata
5 135MB 168MB 33.2MB A_reserved_on_user msftdata
6 168MB 302MB 134MB B_kernel msftdata
7 302MB 303MB 786kB B_kernel-dtb msftdata
8 303MB 336MB 33.2MB B_reserved_on_user msftdata
9 336MB 420MB 83.9MB recovery msftdata
10 420MB 421MB 524kB recovery-dtb msftdata
11 421MB 488MB 67.1MB fat32 esp boot, esp
12 488MB 572MB 83.9MB recovery_alt msftdata
13 572MB 572MB 524kB recovery-dtb_alt msftdata
14 572MB 639MB 67.1MB esp_alt msftdata
15 639MB 1059MB 419MB UDA msftdata
16 1059MB 1562MB 503MB reserved msftdata
1 1562MB 120GB 118GB ext4 APP msftdata
2 120GB 238GB 118GB ext4 APP_b msftdata

$ sudo nvbootctrl get-number-slots
2
tegra-ubuntu:~$ sudo nvbootctrl get-current-slot
0
tegra-ubuntu:~$ sudo nvbootctrl dump-slots-info
Current version: 36.3.0
Capsule update status: 1
Current bootloader slot: A
Active bootloader slot: A
num_slots: 2
slot: 0, status: normal
slot: 1, status: normal
hihonor@tegra-ubuntu:~$ sudo nvbootctrl -t rootfs is-rootfs-ab-enabled
tegra-ubuntu:~$ echo $?
1
tegra-ubuntu:~$
tegra-ubuntu:~$ sudo nvbootctrl set-active-boot-slot B
tegra-ubuntu:~$ sudo nvbootctrl dump-slots-info
Current version: 36.3.0
Capsule update status: 1
Current bootloader slot: A
Active bootloader slot: A
num_slots: 2
slot: 0, status: normal
slot: 1, status: normal

3

hello hanyang369,

you’ll need to reboot the system for switching to other slots.
please also setup serial console to gather the UART logs for checking.

4

Hi JerryChang,
I have rebooted the device and check. The slot didn’t switch after reboot even I set a different slot as active slot. But I find if I use 0 or 1 to set slot A or slot B, it worked.

5

hello hanyang369,

I’ve check the the code, it uses int variable to parse the slot number for setting active boot slot.
please use a single digit for nvbootctrl to switch A/B slots.