Commits on Oct 31, 2024

1. boot: add NuttX bootloader with update and recovery support …

   This commit adds NuttX based bootloader with the support for image
   update and recovery if not confirmed. The algorithm utilizes three
   flash partitions: primary (image runs from this area), secondary
   and tertiary. Secondary and tertiary areas are used for update upload
   and recovery.
   
   The update is performed by simple copy from update area to primary
   area with recovery being created in recovery area if not already present.
   Once image is confirmed by the user, the image in update area is
   confirmed as well, update area becomes recovery area and vice versa.
   This means the recovery is always present (except for the first update)
   and subsequent updates just copy image from update to primary. This
   makes the update significantly faster and more considerable to flash
   wear while keeping the recovery/revert possibility.
   
   A header (aligned to flash's erase size) must be added to the beginning
   of the image. Python script nximage.py can be used to prepend this
   header to built binary. The algorithm also uses one erase page at the
   end of a partition (partition, not image!) to store flags used to
   indicate image confirm status and to detect update/recovery partitions.
   Any program uploading update image to the update partition has to erase
   this page for the boot to work correctly!
   
   The algorithm implementation is based on a patch initially developed
   for MCUboot project but rejected by the project's maintainers
   
   mcu-tools/mcuboot#1902
   
   Signed-off-by: Michal Lenc <michallenc@seznam.cz>

   

   michallenc committed Oct 31, 2024
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