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mcuboot: add support for new "copy with revert" algorithm #1902

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mcuboot: add support for new "copy with revert" algorithm #1902

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Commits on Apr 23, 2024

  1. boot: generalize boot_write_image_ok() function to get flag as parameter 

    This commit generalizes boot_write_image_ok() function to take flag
as an input parameter. Function is also rename to boot_write_image_flag()
so the name matches the usage better.

This is useful to future implementation of different algorithms that
might need other flags than BOOT_FLAG_SET to be written to image
trailer.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
    @michallenc
    michallenc committed Apr 23, 2024
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  2. boot: add new copy with revert algorithm 

    This algorithm uses three flash partitions to copy images to primary slot
without swap mechanism. This way much faster update process can be
achieved but more space on flash has to be allocated. This is basically
trade off between update speed and flash space taken for boot process.

The algorithm always keeps recovery image in either secondary or
tertiary slot and lets the user upload update image to the other one.
Once image is updated and confirmed, update slot is marked as recovery
(the image is already there uploaded by the user) and old recovery is
marked as new update -> user will upload new image there. This means
there are no writes to ota1 and ota2 partitions during boot process
except and therefore there is no speed limitation if usually slower
(compared to embedded flash) external NOR flash is used for these
partitions. The only exception is first update process where bootloader
has to create recovery image.

Overall, this algorithm allows to achieve the speed of overwrite only
algorithm while retaining the revert/recovery option. It is especially
useful for devices with larger images and a lot of free space on
external flash.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
    @michallenc
    michallenc committed Apr 23, 2024
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  3. docs: add entry for new copy with revert algorithm 

    This commit adds documentation entry for new algorithm.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
    @michallenc
    michallenc committed Apr 23, 2024
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  4. boot/nuttx: add configuration for tertiary slot 

    This slot is used in newly introduced copy with revert algorithm. This
commit allows NuttX to support this algorithm.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
    @michallenc
    michallenc committed Apr 23, 2024
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