MSPM0G3507: erasing the memory

Tool/software:

Hello,

I have a question about memory. I have two places marked out in the program for parameters (HWParam addr: 0x00000400 (R) ) and for data (ParamConfig addr: 0x00000800 (RW)).

The parameters are written at initialization and should never be changed. Data is overwritten during the program. 

device_linker.cmd

-uinterruptVectors
--stack_size=512


MEMORY
{
    IntVectors      (RW)  : origin = 0x00000000, length = 0x00000400

    HWParam         (R)   : origin = 0x00000400, length = 0x00000400
    ParamConfig     (RW)  : origin = 0x00000800, length = 0x00000400

    FLASH           (RX)  : origin = 0x00000C00, length = 0x0001F400
    SRAM            (RWX) : origin = 0x20200000, length = 0x00008000
    BCR_CONFIG      (R)   : origin = 0x41C00000, length = 0x00000080
    BSL_CONFIG      (R)   : origin = 0x41C00100, length = 0x00000080
}

SECTIONS
{
    .intvecs:   > 0x00000000

	//Přidáno
    .myData : palign(8) {} > HWParam
    .controllerData : palign(8) {} > ParamConfig

    .text   : palign(8) {} > FLASH
    .const  : palign(8) {} > FLASH
    .cinit  : palign(8) {} > FLASH
    .pinit  : palign(8) {} > FLASH
    .rodata : palign(8) {} > FLASH
    .ARM.exidx    : palign(8) {} > FLASH
    .init_array   : palign(8) {} > FLASH
    .binit        : palign(8) {} > FLASH
    .TI.ramfunc   : load = FLASH, palign(8), run=SRAM, table(BINIT)


    .vtable :   > SRAM
    .args   :   > SRAM
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM (HIGH)

    .BCRConfig  : {} > BCR_CONFIG
    .BSLConfig  : {} > BSL_CONFIG
}

This is how I written to memory

And like this I overwritte the data during the program.

But I have a problem that when the data is overwritten during the program, the parameters(HWParam addr: 0x00000400 (R) ) are also deleted. 

Before overwritten:

After overwritten:

Could someone advise me why the data is deleted, even though a separate place is created for the parameters ? Moreover, if the memory should only be READ ?

Thank for any support