[PATCH v3 0/2] bootstd: New bootmeth for RAUC A/B systems

[Tom Rini]

On Wed, Jun 04, 2025 at 02:15:28PM +0200, Martin Schwan wrote:

> This series implements a new bootmeth for RAUC A/B systems. RAUC (Robust
> Auto Update Controller) is a lightweight update client, providing "Safe
> and Secure OTA Updates for Embedded Linux". See the following links for
> more information about RAUC:
> 
>   https://rauc.io/
>   https://rauc.readthedocs.io/en/latest/
> 
> PHYTEC uses RAUC in its Yocto based distribution "Ampliphy" as the
> default way of updating embedded devices based on PHYTEC hardware. So
> far, the logic selecting the correct partitions and files to boot was
> being implemented in the U-Boot environment. While this is a
> straightforward way to do it, adding and supporting new platforms became
> somewhat tedious and is platform-specific. The introduction of U-Boot's
> "Standard Boot" provided a convincing alternative, promising a simpler
> and more portable way of booting, even for RAUC systems. This led me to
> implement a new bootmeth supporting RAUC A/B systems. Note, that this
> new bootmeth is not proprietary to PHYTEC products and is designed to
> work on other hardware with a RAUC A/B system, too.
> 
> The bootmeth currently only supports symmetric A/B partitioning layouts.
> E.g. A/rescue is not (yet) supported. The partition indexes and default
> slot tries can be specified via configuration options.
> 
> For now, the bootmeth_rauc uses a similar approach for loading the
> Kernel and device tree as the bootmeth_script, in that it requires a FIT
> containing a U-Boot script loading the desired distro. It could be
> possible to support booting without a script and load the Kernel and DT
> directly with this bootmeth, but I found the script method to be very
> flexible for now, in letting the distro decide what to load.
> 
> The bootmeth_rauc was tested on a phyBOARD-Pollux i.MX8M Plus [1] with
> BSP-Yocto-Ampliphy-i.MX8MP-PD24.1.2 [2].
> 
> Supported boot devices are currently only MMC devices, but it should be
> possible to add SPI flashes in the future.
> 
> To test this patch stack with PHYTEC's phyBOARD-Pollux i.MX8M Plus
> board, you need to adjust the boot files to include the boot.scr.uimg
> containing the distro's boot script and set "optargs" to "${raucargs}"
> in it. Also disable any legacyboot in the U-Boot environment and simply
> boot with Standard Boot:
> 
>   bootmeth order rauc
>   bootflow scan -lb
> 
> Regards,
> Martin
> 
> [1]: https://www.phytec.eu/en/produkte/single-board-computer/phyboard-pollux/
> [2]: https://download.phytec.de/Software/Linux/BSP-Yocto-i.MX8MP/BSP-Yocto-Ampliphy-i.MX8MP-PD24.1.2/

I'm really glad to see this and I will take it in to -next once there's
been enough time for people to have a chance to offer review comments.
Thanks!

-- 
Tom
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