Hello sir :)
I think there is a lesson missing in the bootloader Development from ground up.. the lesson after "Sharing functions between the Bootloader and User Application"... but no worries I used the source codes to understand the missing part of "Sharing functions between the Bootloader and User Application" and there is a part that I counldn't understand :
Why some functions shound be...

hello. I need access to the source code of the application programming (IAP) course

I have I doubt in the creation of a section, how do I know the location and the size of the memory section, to optimize the memory for the flash, and do no disturb the memory of the flash