A/B redundancy

[enhany]

Hello,

is there easy way to create A/B rootfs redundancy without included mender?

[dwalkes]

Hi,
If you are talking about Jetpack 4 branches, you should be able to use tegrademo-mender at https://github.com/OE4T/tegra-demo-distro/tree/kirkstone-l4t-r32.7.x as an example and modify to use an update framework of your choice. Others have used swupdate, RAUC, etc and you can find some references to examples in some of the meeting notes and wiki pages.

If you are talking about Jetpack 5 branches, there's no working example yet as there is with Jetpack 4 but there are some basic building blocks available including capsule update and A/B update from NVIDIA. Related discussions in the channel at https://matrix.to/#/#OE4T_jetpack-5-device-update:gitter.im if you'd like to follow along/contribute.

[enhany]

Hi,
thank you, yes, it's for Jetpack 4 branch.

I want to use A/B just for fail-over, not for updates. So need to crop all Mender staff from tegrademo-mender is the best option?

[dwalkes]

I want to use A/B just for fail-over, not for updates

Got it

So need to crop all Mender staff from tegrademo-mender is the best option?

Not necessarily - I think all you'll need to do is define a custom partition with both a/b slots included, you can use https://github.com/mendersoftware/meta-mender-community/tree/kirkstone/meta-mender-tegra/recipes-bsp/tegra-binaries/mender-custom-flash-layout and/or #858 as a guide.

Then you just need to enable redundancy using one of the methods in https://docs.nvidia.com/jetson/archives/r34.1/DeveloperGuide/text/SD/Bootloader/UpdateAndRedundancy.html#enabling-bootloader-redundancy - see possibly related discussion at #1267

So you might want to use the tegra demo distro and tegrademo-mender as a working example and a reference for troubleshooting issues with your custom one built without these layer(s) and the extra mender dependencies.

[enhany]

It works, thank you.