Storing data in flash of micro at a specific place

[Boscoe]

Hi all,

I'm currently developing a product with a bootloader and an application program to go with it. For ease in production I would like to include the application binary into the C code of the bootloader to create one binary of bootloader + preinstalled application. I'm not sure how to do this as I need to store the application at a specific flash address - not just where the bootloader finishes. I'm using an STM32L052 micro.

Thanks

[lucazader]

A simple way (so long as you are doing using flash read out protection etc):
Program the bootloader and application as you normally would. to their respective locations.
Then read out the flash and save to a bin/hex file. (use stlink utility or stmcubeprogrammer).

[bson]

Build the bootloader and application as two separate images relocated to their respective load address, and then combine the images.  In a format like extended tekhex this is trivial since each record has a load address, you just need to make sure the only launch address remaining is that of the boot loader.

If you need them to be able to refer to each other using symbols, then you need to compile either or the other with a different psect prefix and handle section relocation in the link script.

[rstofer]

How about just changing the Flash start address in the linker script.  In fact, you could create a .section for the bootloader code and just add the bootloader.o file to the list of files.  ld will handle the details.