CCS/TM4C1230C3PM: Problem dealing with FLASH

Tool/software: Code Composer Studio

Hello Friends,

In my project i am supposed to write some values  to the internal FLASH memory of the microntroller TM4C1230C3PM) . We actually can read and write to the flash memory, but after REBOOT  i am encountering the problem "CORTEX_M4_0: Can't Run Target CPU: (Error -1268 @ 0x1090001) Device is locked up in Hard Fault or in NMI.  " 

The setting of my memory for the microcontroller is as follows :

/******************************************************************************
 *
 * Default Linker Command file for the Texas Instruments TM4C1230C3PM
 *
 * This is derived from revision 15071 of the TivaWare Library.
 *
 *****************************************************************************/

--retain=g_pfnVectors

MEMORY
{
    FLASH (RX) : origin = 0x00000000, length = 0x00007C00
    SRAM (RWX) : origin = 0x20000000, length = 0x00003000
	FLASHDATA (RWX) : origin = 0x00007C00, length = 0x00000400

}


/* The following command line options are set as part of the CCS project.    */
/* If you are building using the command line, or for some reason want to    */
/* define them here, you can uncomment and modify these lines as needed.     */
/* If you are using CCS for building, it is probably better to make any such */
/* modifications in your CCS project and leave this file alone.              */
/*                                                                           */
/* --heap_size=0                                                             */
/* --stack_size=256                                                          */
/* --library=rtsv7M4_T_le_eabi.lib                                           */

/* Section allocation in memory */

SECTIONS
{
    .intvecs:   > 0x00000000
    .text   :   > FLASH
    .const  :   > SRAM
    .cinit  :   > FLASH
    .pinit  :   > FLASH
    .init_array : > FLASH

    .vtable :   > 0x20000000
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM
}

__STACK_TOP = __stack + 512;

and the function used in my FW are:

#define FLASHDATA_VERSION  ((uint32_t) 0x00007C00)
#define FLASHDATA_ADC1_CAL ((uint32_t) 0x00007C00 + 4)
#define FLASHDATA_ADC2_CAL ((uint32_t) 0x00007C00 + 8)
#define FLASHDATA_ADC3_CAL ((uint32_t) 0x00007C00 + 12)

uint8_t read_byte[4] = { 0x00, 0x00, 0x00, 0x00 };
uint32_t flashBuffer[5] = { 0, 0, 0, 0, 0 };
            FlashProtectSet(FLASHDATA_VERSION, FlashReadWrite);
            FlashErase(FLASHDATA_VERSION);
            FlashProgram(flashBuffer, FLASHDATA_VERSION, 4);
            FlashProgram(flashBuffer + 1, FLASHDATA_ADC1_CAL, 4);
            FlashProgram(flashBuffer + 2, FLASHDATA_ADC2_CAL, 4);
            FlashProgram(flashBuffer + 3, FLASHDATA_ADC3_CAL, 4);

            for (i = 0; i < 4; i++)
            {
                read_byte[i] = *(uint8_t *) (FLASHDATA_VERSION + (sizeof(uint8_t) * i));
            }
            for (i = 0; i < 4; i++)
            {
                read_byte[i] = *(uint8_t *) (FLASHDATA_ADC1_CAL + (sizeof(uint8_t) * i));
            }
            for (i = 0; i < 4; i++)
            {
                read_byte[i] = *(uint8_t *) (FLASHDATA_ADC2_CAL + (sizeof(uint8_t) * i));
            }
            for (i = 0; i < 4; i++)
            {
                read_byte[i] = *(uint8_t *) (FLASHDATA_ADC3_CAL + (sizeof(uint8_t) * i));
            }

            FlashProtectSet(FLASHDATA_VERSION, FlashReadWrite);

Note: I am actually reading the values written to the flash Memory correctly when i check them in the Debugger.

Thank you in advance for your valuable feedback.

with regards,

Marco.