Linker Script Question about stm32-bootloader

[akospasztor]

Hi there,

In your bootloader project, you should set up the .ld file (or .sct if you're using Keil, or .icf if you're using IAR) so that it reflects only the bootloader image only and does not include the application image (or any other region that is not used by the bootloader). The bootloader and the application should know ideally "nothing" about the existence of each other. Specifically, the bootloader should not know anything about the application itself (except where to jump, which is the application starting address).

Within the application project, the only thing that you should adjust is the starting address of the application. This means you should configure your .ld file so that the starting address is the actual address (within your MCU flash) where your application starts. Additionally, either of the bootloader or the application itself should set the vector table location of the application so that the interrupts within your application would work. Please refer to the README (https://github.com/akospasztor/stm32-bootloader#how-to-use) for detailed description.

In conclusion, you should perform the followings:

1. Configure the .ld file of the bootloader to reflect only the bootloader region in your flash (e.g. starting from 0x0800 0000 with a size of 0x8000).
2. Configure the .ld file of your application so that it reflects your application region (e.g. starting from 0x0800 8000 with a size of e.g. 0x10000).
3. For the update cache and your configuration region, you can reserve an empty region within your application's .ld file, but it is actually not necessary.

I hope this helps.

Best,
Akos

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