Padding end of Zephyr application

[kpreiss]

Hi,

We need the ability to pad the end of our Zephyr application for 8 byte alignment.  Is there a way to do this?

Thanks

[kpreiss]

Hi Sigurd,

Our Zephyr application images are encrypted and require the end FLASH address to fall on an 8 byte boundary.  We use our own custom non-Zephyr bootloader to decrypt the Zephyr application from SPIFLASH prior to programming into FLASH memory.

We use a custom linker script file to locate variables in certain sections of SRAM and FLASH memory.  Is there a simple way to modify the alignment of code/data at the end of FLASH memory?

In the past, a simple ". = ALIGN(8);" statement in the linker script file will work to pad memory to an 8 byte alignment at the end of FLASH.

Thanks!

[Sigurd]

Hi,

I don't see any option in Zephyr to this. As far as I can see, it looks like it's set to align 4. https://github.com/zephyrproject-rtos/zephyr/blob/main/include/zephyr/arch/arm/aarch32/cortex_m/scripts/linker.ld#L146

But there could be some other ways to do it. Maybe you could check with the Zephyr community in the Zephyr discord. https://docs.zephyrproject.org/latest/develop/getting_started/index.html#asking-for-help