Creating non-eraseble Flash Memory Space

[mazotcu16]

Hello, i am using STM32H723 Microcontroller. I need to create a region in the memory(preferably whole sector 7) that is not erasable during debugging process. To do this i made the following changes in the linker script:

MEMORY
{
  ITCMRAM (xrw)    : ORIGIN = 0x00000000,   LENGTH = 64K
  DTCMRAM (xrw)    : ORIGIN = 0x20000000,   LENGTH = 128K
  FLASH    (rx)    : ORIGIN = 0x08000000,   LENGTH = 896K
  USER_DAT (r)     : ORIGIN = 0x080E0000,   LENGTH = 128K
  RAM_D1  (xrw)    : ORIGIN = 0x24000000,   LENGTH = 320K
  RAM_D2  (xrw)    : ORIGIN = 0x30000000,   LENGTH = 32K
  RAM_D3  (xrw)    : ORIGIN = 0x38000000,   LENGTH = 16K
}

SECTIONS
{
untouched areas
.
.
  .user_data(NOLOAD) :
  {
    . = ALIGN(4);
    KEEP(*(.user_data))
  } > USER_DAT

And i am trying to write to this memory space with HAL_FLASH Functions. But when i debug, my datas are erased. How can i do this?

[SofLit]

Hello,

I think you can keep that region (User_DAT) undeclared in the linker.

USER_DAT (r)     : ORIGIN = 0x080E0000,   LENGTH = 128K

[mazotcu16]

Hello, Thank you for your answer.
I tried it and it is erased again.

[Andrew Neil · Accepted solution]

Seems similar to this:

https://community.st.com/t5/stm32cubeide-mcus/partial-or-full-chip-erase-before-programming/td-p/683539