Compiler/MSP430FR2111: Placing stack into FRAM

Hi Cash,

Running any code will do it, but the simplest example I can do is to start a new empty project and just go into low power. 

main.c

#include <msp430.h>

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;

    __bis_SR_register(LPM3_bits | GIE);

    return 0;
}

lnk_msp430fr2111.cmd exactly as in the generated one, except the following lines 

.cio        : {} > FRAM                  /* C I/O buffer                      */
.sysmem     : {} > FRAM                  /* Dynamic memory allocation area    */
.bss        : {} > FRAM                  /* Global & static vars              */
.data       : {} > FRAM                  /* Global & static vars              */
.TI.noinit  : {} > FRAM                  /* For #pragma noinit                */
.stack      : {} > FRAM (HIGH)           /* Software system stack             */

Hi Cash.

I have an update on this, having come back to it after some other wok.

The answer is quite obvious really, FRAM write protection needs to be turned off. By default the write enable flag is set, so the stack can't actually be written into FRAM. By breakpointing into the c_int00 routine and setting the register manually via the debugger, I was able to run my program normally.

My question is now how I go about disabling the FRAM write protection in the startup routine, since I can't just edit the boot_special.c file. So am I right in thinking that I'll be able to use the linker to define a custom startup address and create my own c_init00 routine?

Edit: So I redefined _system_pre_init to be

    int _system_pre_init(void) {
        SYSCFG0 = FRWPPW;

        return 1;
    }

But this only works if I pause and resume the program via the debugger. Just running the program will never reach main, but after a pause and resume, it will start main. I'm wondering if this is because there needs to a delay after this. Have tried a few delays but still not resolved.

Cheers