DFU-OTA project main file to assembly language file transition.

RE: DFU-OTA project main file to assembly language file transition.

Hung Bui — Mon, 21 Mar 2022 08:59:16 GMT

Hi Vinay,
I would suggest to have a look at the videos from David Brown (main contributor to MCUBoot) here: https://www.youtube.com/watch?v=qMMD0WcKShc&ab_channel=DavidBrown

And have a look at the documentation here.

- The image is downloaded to secondary slot. The actual location of the secondary slot can be found in partitions.yml in build folder if partition manager is used.

- I believe the reset is handled inside zephyr_os_mgmt.c . Please have a look at the documentation of MCUMgr here.

- I'm not sure I fully understand what you meant by "key and image extraction" but if you are looking for where the signature is verified it should be at step 2 in MCUBoot here.

RE: DFU-OTA project main file to assembly language file transition.

Shikamaru — Mon, 21 Mar 2022 06:22:37 GMT

Thanks @Hung Bui.

some query related to the same example.

1.While sending image from Bluetooth(mobile app) , "where it is downloading the image nd where it is storing the image" ?

2. Once controller received the complete image , "DFU soft reset will run. from where it is getting reset"?

3. from where "the key and image extraction is running".

RE: DFU-OTA project main file to assembly language file transition.

Hung Bui — Fri, 18 Mar 2022 15:04:07 GMT

Hi Vinay,

No I don't think it's printed by the zephyr.lst file. The file is the Assembly auto generation from the application code.

What you need to look for where it prints out "Primary image:" is in swap_status_source() function in swap_move.c in bootloader\mcuboot\boot\bootutil\src

Another location where it may print "Primary image" is in swap_scratch.c but it depends on the activity you are doing with MCUBOOT.