MSP430FR4133: MSP430FR4133 FreeRTOS - Heap on FRAM

Part Number:MSP430FR4133

I am testing the msp430fr4133 with the FreeRtos, everything works fine when using the heap in the SRAM. However, this mcu has only 2 KB of ram, so i tried to move the heap from the sram to the fram. I followed the same procedure of the RTOSDemo for the msp430FR5969:

In FreeRtosConfig file:

#define configAPPLICATION_ALLOCATED_HEAP        1

and i declared the "heap array" on main.c:

#pragma PERSISTENT(ucHeap)     /* CCS version. */
uint8_t ucHeap[configTOTAL_HEAP_SIZE] = { 0 };

The code compiles perfectly and the data is moved to the fram however the allocation always fails with all the heap files (heap1.c, heap2.c, etc...).

I believe this is a problem related with the msp430 fram memory not the freertos, because if i try to write "manually" any value on this array it "fails" ( the content of each position is always 0x00).

i also looked at the linker cmd file and it seems ok:

    GROUP(ALL_FRAM)
    {
       GROUP(READ_WRITE_MEMORY)
       {
          .TI.persistent : {}                /* For #pragma persistent            */
       }

       GROUP(READ_ONLY_MEMORY)
       {
          .cinit      : {}                   /* Initialization tables             */
          .pinit      : {}                   /* C++ constructor tables            */
          .init_array : {}                   /* C++ constructor tables            */
          .mspabi.exidx : {}                 /* C++ constructor tables            */
          .mspabi.extab : {}                 /* C++ constructor tables            */
          .const      : {}                   /* Constant data                     */
       }

       GROUP(EXECUTABLE_MEMORY)
       {
          .text       : {}                   /* Code                              */
       }
    } > FRAM

Am i missing something? I cant figured out what is happening.