SAMD21J18A bootloader advice

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Hi All


I have my setup which includes the WINC3400 with the SAMD21J18A.


I have created a project, which simple downloads a block of data, splits it up into smaller blocks of 64 bytes so that it can be written to flash.


I would like to know is there an example or any guide I can follow to set up this project as a bootloader?


I will also need to have the function that writes to the flash.


If I am correct I can specify the size of the bootloaders and application?


At moment my bootloader project is about 65K, as it also includes the drivers for WIN3400, therefore the remaining can be for the application.