zephyr: [Zephyr v1.14.0] stm32: MCUboot bootloader results in Hardware exception

Describe the bug I tried to support MCUboot bootloader in some STM32 platform SOCs but with no success. After building the bootloader from the mcuboot repository, when flashed it results in a Hardware Exception.

I’ve tried with the following Zephyr revisions:

• tags/v1.14.0
• v1.14-branch (6950a38cb3)
• HEAD

and mcuboot at master (fc07eab)

The target socs/boards I’ve tried are:

• nucleo_f401re (there is already DTS suppport)
• nucleo_l496zg (I’ve added DTS support)
• custom board with STM32L496RE

To Reproduce Steps to reproduce the behavior:

1. cd mcuboot/boot/zephyr
2. mkdir build; cd build
3. cmake -GNinja -DBOARD=nucleo_f4014re ..
4. ninja
5. ninja flash
6. See the error

Expected behavior See the bootloader boot.

Impact Blockage

Screenshots or console output

• Zephyr@v1.14.0

***** USAGE FAULT *****
  Illegal load of EXC_RETURN into PC
***** Hardware exception *****
Current thread ID = 0x00000000
Faulting instruction address = 0x8008060

• Zephyr@v1.14-branch

***** USAGE FAULT *****
  Illegal load of EXC_RETURN into PC
***** Hardware exception *****
Current thread ID = 0x00000000
Faulting instruction address = 0x8008058

• Zephyr@HEAD Everything work as expected

Environment (please complete the following information):

• OS: GNU/Linux
• Toolchain: Zephyr SDK
• Commit SHA: various