[GitHub] [incubator-nuttx] xiaoxiang781216 commented on pull request #4191: Add BOARDCTL_SWITCH_BOOT to support switch Boot A/B system

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xiaoxiang781216 commented on pull request #4191:
URL: https://github.com/apache/incubator-nuttx/pull/4191#issuecomment-883941665


   > Seems rather application-specific.  Have you considered the generic BOARDIOC_IOCTL instead?Sent from my Galaxy
   
   Yes, but it isn't too specific. If the board support A/B boot, something like BOARDIOC_SWITCH_BOOT is required to commuicate the boot partition from userspace(OTA subsystem) to board, so it's a common requirement for A/B boot:
   
   1. Download the new image from the sever
   2. Write the new image to the alternative partition
   3. Call BOARDCTL_SWITCH_BOOT to the alternative system
   
   This is even useful in the single boot partition case, if we want to implement the reliable update:
   
   1. Download the new image from the sever
   2. Call BOARDCTL_SWITCH_BOOT and reboot to a small system
   3. Write the new image to the main partition in the small system
   4. Call BOARDCTL_SWITCH_BOOT again to the main system
   
   You can see that it's key point to allow updater switch the boot partition.


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