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docu: added update validation documentation #170

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JanZachmann merged 3 commits into from
Jun 25, 2025
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docu: added update validation documentation #170

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docu: added update validation documentation
JanZachmann Jun 23, 2025
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JanZachmann Jun 24, 2025
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JanZachmann Jun 24, 2025
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2 changes: 2 additions & 0 deletions src/twin/firmware_update/update_validation.md
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After flashing an update to the new root partition, the device boots this partition and it is probed if the update was successful. Only after this test has passed successfully, the new root partition is permanently set for booting the device. Otherwise, if the goal state for a valid update wasn't reached, a reboot is triggered which boots to the old root partition.

:exclamation: There is one exception from this behavior. In case the update includes a bootloader update too, the device cannot recover by booting to the old partition due to potential backward compatibility issues. Consequently the system is booted to the new partition even if validation failed. In a worst case scenario this might lead to a reboot loop.

## Criteria for a successful update

The following checks must be passed in order to successfully validate an update:
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