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STM32 TrustZone FLASH_NSC vs FLASH memory map overlap

RZub
Associate II

Hello,

I have a question about the flash memory map in the Secure project.

I’m using the following application as an example:

STM32Cube_FW_H5_V1.5.1\Projects\NUCLEO-H563ZI\Applications\ROT\OEMiROT_Appli_TrustZone\STM32CubeIDE


In the memory map, two flash regions are shown:
 - FLASH:              0x0c018400 - 0x0c01dfff
 - FLASH_NSC:    0x0c01c000 - 0x0c01c3ff

RZub_0-1768476811291.png


Question:

Should the FLASH_NSC region overlap the FLASH area, or should it be placed after the FLASH region?

If it should overlap, what is the purpose of doing that? In this example, it overlaps.

Thank You.

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