updates on scatter file getting deleted after building code

[vishwadn]

Hi,

 I tried adding APPKEY on the flash to read from bootloader to find if valid application there or not. I added as below in scatter file :

EXCLUDE app_key.o

APPKEY 0x08043FF8 FIXED { ; 0x08013FF0 = last 16 bytes of 64KB app
app_key.o (.app_key)
}

 

and in app_key.c, below lines are added:

__attribute__((used))
__attribute__((section(".app_key")))
const unsigned int APPKEY = 0xFEFFFEFF;

But once code is built, changes done in scatter file are disappearing and also when I check in map file, app_key is not getting allocated in specified location of flash

 

  

[Saket_Om]

Hello @vishwadn 

It is possible that the IDE or build system is regenerating the scatter file automatically.

Please Check your project settings :

• In Keil/MDK, go to Project > Options for Target > Linker and ensure "Use Memory Layout from Target Dialog" is unchecked.
• Specify your custom scatter file in the linker settings.