How I Program the CPU2 memory area using STM32CubeProgrammer?

Question

I'm trying to understand how I program the BLE Stack and FUS in the CPU2 of STM32WB55G (1Mb). When I use the binary available of ST repositoy, in default mode I program the "stm32wb5x_BLE_Stack_full_fw.bin" in address started 0x08000000, but in the release_note that is available of ST repository, it's show us that the binary needs program in address started 0x080D0000:

When I program with this configuration and also program the "BLE_Ota", the application works (I can see the device in the app "ST BLE SENSOR"). But I didn't understand like it works, because the BLE_Ota start address in the 0x08000000 and it's overwrite the program previous (stm32wb5x_BLE_Stack_full_fw.bin), right?

I did any tests: I Followed the video "STM32WB Getting Started Series: Part 7, Over-the-Air (OTA)" for understand the construction of memory, I understood that the memory of CPU 1 is 0x0800000 until 0x080CB000 and CPU 2 is 0x080CB000 until 0x080FFFFF:

So, when I try to read the memory of 0x080CB000, I get this message in STM32CubeProgrammer:

But, if I try read one byte less, it's works:

With these tests, I can understand that the STM32CubeProgrammer cannot read CPU 2. How did the firmware "stm32wb5x_BLE_Stack_full_fw.bin" go to CPU 2 and did the application work? How do I read or write to CPU 2 by STM32CubeProgrammer?

Remy ISSALYS · Accepted Answer

Hello,You can look this wiki page which talk about how to setup your board and explain the procedure to upgrade the FUS and the wireless stack: https://wiki.st.com/stm32mcu/wiki/Connectivity:STM32WB_BLE_Hardware_SetupThe address in the release note is the optimal address for flashing the wireless stack, so it advise to follow it. The SFSA option bytes correspond to the secure start address for the Flash memory and it's not possible to read the flash secure part. Best Regards

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