the file: thingy53_nrf5340_cpuapp.conf in v2.6.0/bootloader/mcuboot/boot/zephyr/boards

Hi Community,

I made a custom board based on thingy53, created a similar custom board file folder.

The application code can be compiled correctly with the original thingy53 board, but If I try to compile the same code with the custom board, it will be not successful.
Then I compared the output from the compile, If I use my custom board the step with  v2.6.0/bootloader/mcuboot/boot/zephyr/boards/thingy53_nrf5340_cpuapp.conf is missing.

after add a similar file for my custom board under the same folder, it works, the compile is successful. 

My question are: 

1. what's the function of this file?

2. because the folder is a offcial folder from the software, how can I import this file into my project folder, so I can manage it in my project?

Best regards

Danny 

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