I’m using R32.7.2, and a bare Jetson Xavier NX Development Kit, with a 32 GB SDCard.
I want to do an OTA update without version upgrade. I just want to change the content of the rootfs.
Summarized, what I did:
-
Flashed the device with ROOTFS_AB=1
-
Created ota_payload_package
-
Copied the ota_payload_package and the ota_tools to the device
-
Ran nv_ota_start.sh on the device
The script finished with OTA update is completed, device will boot to the slot that is updated.
THE PROBLEM: On the next start, the kernel still has mmcblk0p1 mounted as its root partition, altough nvbootctrl says that slot 1 is active.
It seems that CBOOT passes wrong kernel command line. Especially, rootfs is the wrong one.
[0010.239] I> Linux Cmdline: console=ttyTCU0,115200 root=/dev/mmcblk0p1 rw rootwait rootfstype=ext4 console=ttyTCU0,115200n8 console=tty0 fbcon=map:0 net.ifnames=0 video=tegrafb earlycon=tegra_comb_uart,mmio32,0x0c168000 gpt rootfs.slot_suffix=_b usbcore.old_scheme_first=1 tegraid=19.1.2.0.0 maxcpus=6 boot.slot_suffix=_b boot.ratchetvalues=0.4.2 vpr_resize sdhci_tegra.en_boot_part_access=1
CBOOT should have passed the rootfs UUID, but passes /dev/mmcblk0p1, which is APP and not APP_b.
Further analysis: CBOOT takes kernel command line from the new active kernel partition, which contains exactly the a.m. command line. The kernel partition is written by nv_ota_update_without_layout_change.sh:update_rootfs_with_UE() in this section:
#
# When ROOTFS A/B is enabled, the images update on kernel/kernel-dtb partitions
# are tied to rootfs update. So we need to run "nv_bootloader_payload_updater"
# with individual partition update option to update specific partition.
#
# When ROOTFS A/B is disabled, the images update on kernel/kernel-dtb partitions
# are done along with bootloader update (in function update_bootloader_with_UE).
#
# Update kernel and kernel-dtb partition
local _nv_bootloader_payload_updater=
_nv_bootloader_payload_updater="$(which nv_bootloader_payload_updater)"
cp -f "${kernel_only_image}" "/opt/ota_package/bl_update_payload"
if ! eval "${_nv_bootloader_payload_updater}" --part "kernel${suffix}"; then
ota_log "Failed to run \"${_nv_bootloader_payload_updater} --part kernel${suffix}\""
return 1
fi
if ! eval "${_nv_bootloader_payload_updater}" --part "kernel-dtb${suffix}"; then
ota_log "Failed to run \"${_nv_bootloader_payload_updater} --part kernel-dtb${suffix}\""
return 1
fi
I don’t understand how this can work: The ota_payload_package contains a single kernel_only_payload, which is flashed to the new active kernel partition via nv_bootloader_payload_updater. Don’t you need two different kernel images depending on the slot? Because the kernel image contains the command line, including the rootfs partition UUID?
What I did in detail:
wget https://developer.nvidia.com/embedded/l4t/r32_release_v7.2/t186/jetson_linux_r32.7.2_aarch64.tbz2
wget https://developer.nvidia.com/embedded/l4t/r32_release_v7.2/t186/tegra_linux_sample-root-filesystem_r32.7.2_aarch64.tbz2
tar xpf jetson_linux_r32.7.2_aarch64.tbz2
cd ./Linux_for_Tegra/rootfs
sudo tar -jxpf ../../tegra_linux_sample-root-filesystem_r32.7.2_aarch64.tbz2
cd ../..
wget https://developer.nvidia.com/embedded/l4t/r32_release_v7.2/t186/ota_tools_r32.7.2_aarch64.tbz2
tar xpf ota_tools_r32.7.2_aarch64.tbz2
cd Linux_for_Tegra/
sudo ./apply_binaries.sh
sudo ROOTFS_AB=1 ./flash.sh jetson-xavier-nx-devkit mmcblk0p1
When the device started up, I entered default values in the configuration dialog.
Clone running file system:
sudo ./flash.sh -r -k APP -G my-jetson-fs jetson-xavier-nx-devkit mmcblk0p1
mkdir -p ../tmp-fs
sudo mount -o loop my-jetson-fs.raw ../tmp-fs
Create OTA package:
export TARGET_BSP=/home/klaus/work/R32.7.2/Linux_for_Tegra
export BASE_BSP=/home/klaus/work/R32.7.2/Linux_for_Tegra
sudo ./tools/ota_tools/version_upgrade/build_base_recovery_image.sh jetson-xavier-nx-devkit R32-6 ${BASE_BSP} ${BASE_BSP}/rootfs ${TARGET_BSP}
( cd ../tmp-fs && sudo tar -cvpzf ../image_fs.tar.gz --exclude=./data --exclude=./image_fs.tar.gz --one-file-system ./ )
cp tools/ota_tools/version_upgrade/nv_ota_rootfs_updater.sh rootfs_updater.sh
sudo ./tools/ota_tools/version_upgrade/l4t_generate_ota_package.sh -sr -o rootfs_updater.sh -f ../image_fs.tar.gz jetson-xavier-nx-devkit R32-6
On Device:
sudo -i
mkfs.ext4 /dev/mmcblk0p12
mkdir -p /data
echo '/dev/mmcblk0p12 /data ext4 defaults 0 0' >> /etc/fstab
mount -a
mkdir -p /data/ota_work /data/ota
export WORKDIR=/data/ota_work
ln -s /data/ota_work/ /ota_work
ln -s /data/ota /ota
On Host
scp bootloader/jetson-xavier-nx-devkit/ota_payload_package.tar.gz <device-ip>:/data/ota
scp ../ota_tools_r32.7.2_aarch64.tbz2 <device-ip>:/data/ota_work
On Device:
cd /data/ota_work
tar xf ota_tools_r32.7.2_aarch64.tbz2
cd Linux_for_Tegra/tools/ota_tools/version_upgrade/
./nv_ota_start.sh /dev/mmcblk0 /ota/ota_payload_package.tar.gz