Place constant at end of used flash - not specific address

[LCE]

Heyho,

how can I put a constant at the end of the STM32's used flash? (using: STM32CubeIDE)

Not at a specific address (that's not a problem), but I'd like to have a constant always at the end of the used internal flash, independent of any other source code changes.

I just find that there's some ASCII characters = "ASCII" (twice) and lots of 0x00 at the end of my H7 and F7 bin files - that from my sources or placed by CubeIDE?

Thanks!

[mfgkw]

An alignment of 4 would be sufficient :)

[Radosław]

*.map file will show you what was places after your section. 

I'm wondering why you do this?  

[LCE]

> I'm wondering why you do this?  

Part of file check for bootloader / application update

[Radosław]

That i'm gessing, but still, not exacly understand why this method,

I'm juster after creating my bootleader for many decives  (end of flash was that last thing to bothering),   

[LCE]

Paranoia! :D

[LCE]

Shoot, now the STM32CubeProg complains about the *.elf file :

Warning: File corrupted. Two or more segments defines the same memory zone

---

And it doesn't load the complete flash content into the programmer.

:(

And this is very bad for first time flashing in production.

[mfgkw]

Showing your ld file could help helping ...

I tried a small project with this change in the ld file:

...

/* User_heap_stack section, used to check that there is enough "RAM" Ram type memory left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM

ENDOFFLASH :
{
. = ALIGN(8);
} >FLASH

/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}

.ARM.attributes 0 : { *(.ARM.attributes) }
}

In the c file I added a variable like this:

const int __attribute__((section("ENDOFFLASH"))) lastVariable = 123;

[Radosław]

ENDOFFLASH :
{

. = ALIGN(8);

*(ENDOFFLASH)

} >FLASH

Input section and output, don't mix this. Also used attribute for variable or keep for section should me used