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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