About the behavior of bootloader

[komuro]

I would like to confirm the update process when using nRF5SDK160098a08e2.

I am aware of the following update process
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Startup process:
-MBR checks NRF_UICR->BOOTLOADERADDR and jumps to bootloader if the address is set.
-MBR checks NRF_UICR->BOOTLOADERADDR and jumps to SoftDevice if the address is not set.


After jumping to bootloader:
-When an update is required: Perform the update and jump to SoftDevice.
-When update is not needed: Jump to SoftDevice without doing anything.
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Confirmation:
-Is there any problem with the above recognition of the bootloader behavior?
-Is there any difference in the result between the case without bootloader and the case with bootloader and no update?

[Vidar Berg]

Hello,

Yes, it looks like you have understood the startup sequence correctly. The only difference from the application's point of view when a bootloader is present should be that  you get a slightly longer startup time since the program execution has to go through the bootloader first (how long it takes depends mostly on the selected boot validation strategy: Boot validation). 

Best regards,

Vidar