Debugger don't step inside functions other than main in project

Hello, project configured for ARM CM55, compiler optimization -Ofast, link time optimizations disabled

Here is main function


int main() {

printf("!");

printf("hello!");

/* testAll_flatten();*/

return 0;

}

Debugger can step in main and output printf() in console but when i comment printf() and uncomment testAll_flatten module, that contains different tests, function calls etc i see next errors and warnings and cannot debug my project or just see printf() in console...


and after pressing Continue i see only

wait
continue
NORMAL_TERMINATION
Execution stopped in Secure Privileged Thread mode at 0x000010E4 due to application reaching end of execution
0x000010E4 BKPT #0xab


Here I attach additional info about debug configuration and scatter file

https://drive.google.com/file/d/16Q9u_kfOA9pnwwTqkNLxrN0y0fKmiXom/view?usp=sharing (scatter file)

Similar problems are encountered in other larger projects configured in a similar way, I suspect that there may be something wrong with my scatter file, or that some functions, files, (if I understood correctly) are not in the execution range... 

How to fix that and how to debug without these problems?