How is Bootloader copied to RAM

[Aadishri GS]

I am new to Bootloader and was going through the Secure BL example without SD but with UART

Here I observe that the Linker Option Shows the RAM and ROM address for the Bootloader-Start point

1. I want to know what procedure is followed to copy the bootloader from ROM to RAM. Is there a function / vector in MBR that executes out of flash and copies the bootloader from flash to RAM before Bootloader executes from RAM?

2. Will the Bootloader be present in the RAM even after its execution is completed and the control moves to application? In the code I see that nrf_bootloader_app_start() never returns meaning Bootloader will never be wiped from RAM

[Andy]

The bootloader is stored persistently in flash, not in RAM.

[Aadishri GS]

I understand that only Flash is persistent. I wanted to know if it is copied to RAM before execution on reset and if yes, does the MBR have instruction ready to copy

[Andy]

I don't understand your question. Where did you get that information that "something" is copied to RAM?

[Aadishri GS]

Sorry, something = Bootloader. Is the question clear? I inferred from the fact that Application is copied from flash area to RAM for execution

[Andy]

No, the bootloader simply "jumps" to the application's start address in flash.

[Aadishri GS]

Thanks. But, why is there a mention of RAM address range in Memory region? Please refer the image I have attached