Nvidia Jestson JetPack 5.x rootfs slot A/B update

[maciej-narojczyk]

Working PoC for AGX Orin.
Please comment.
This will probably break JP 4.x stuff as it is now. DO NOT MERGE
Open point is. How to handle both JP 4.x and JP 5.x with single branch ?

Only rootfs update, bootloader update is missing.
Happy path only, rollback is not working yet.

[dwalkes]

Thanks @maciej-narojczyk ! See discussion in gitter chat - @maciej-narojczyk could you please target https://github.com/OE4T/meta-mender-community and the kirkstone-r35.x branch there instead so we don't break existing Jetpack 4 kirkstone deployments? We'll revisit upstream merges once we get Jetpack 5 working/tested on our OE4T fork.

[TheYoctoJester]

Thanks @maciej-narojczyk, will give it review and test build on Tuesday, presumably. Paging @MuchoLucho for thoughts.

[dwalkes]

@MuchoLucho @TheYoctoJester would appreciate your feedback on the related PR at OE4T/tegra-demo-distro#264 as well, especially OE4T/tegra-demo-distro#264 (comment). Since we no longer need uboot integration and don't have grub integration would it be easier to avoid mender-full and instead just include a subset of features or perhaps just directly build the mender image file and include the mender client in a custom image. The goal is to include a demo-image-mender in the list of images supported in tegra-demo-distro without needing to maintain a full distro dedicated to mender as we have in the past.

[TheYoctoJester]

@maciej-narojczyk I'll close the one here and lets consolidate discussion at OE4T#17