Thistle works with bootloaders in order to support root filesystem image update. Like all updates performed on the Thistle Platform, it is applied with an A/B policy - allowing to always fallback if an issue is encountered during the application of the update. Full system A/B boot process
As for any bootloader setup supported by the Thistle Update Client, it is required to have 2 partitions available, that will be used as root filesystem alternatively.
Multiple bootloaders are compatible with the Thistle Update Client. We provide reference implementations for Raspberry Pi 4, and U-Boot. If your platform uses a third party bootloader, feel free to explore the Custom bootloader. In any case, feel free to reach out in our discord channel - we would be more than happy to hear about your bootloader setup and help with integration!