Hello,
I am experiencing two issues that started after updating STM32CubeAI Studio. Both worked correctly before the update.
---
Environment
- Board: NUCLEO-N657X0-Q
- STM32CubeAI Studio: latest update (STEdgeAI Core v4.0.0)
- STM32CubeIDE: 2.1.1
- STM32CubeProgrammer: v2.22.0
- ST-LINK FW: V3J17M10
- Model: MobileNetV3-based custom model (ONNX), int8 quantized and float variants
---
Issue 1: Build failure – CMSE stub too far (float model)
When using a float ONNX model (~19 MB weights), the Appli build fails with:
ERROR: CMSE stub (.gnu.sgstubs section) too far (0x135e520) from destination (0x52f0)
collect2.exe: error: ld returned 1 exit status
Additionally, the linker reports multiple memory regions not declared in the generated `STM32N657X0HXQ_LRUN.ld`:
warning: memory region 'AXISRAM2' not declared
warning: memory region 'AXISRAM3' not declared
... (AXISRAM4, AXISRAM5, AXISRAM6, XSPI1, XSPI2, ROM)
This build succeeded before the update with the same model.
---
Issue 2: Flash failure – flash loader cannot be loaded (int8 model)
When using the int8 quantized model (~4.9 MB weights), the build succeeds (0 errors) but flashing fails:
```
Error: flash loader cannot be loaded.
Error: failed to download Sector[0]
Error: failed to download the File
Run failed: Error: STM32CubeProgrammer exited with code 1
```
The programmer attempts to flash `run-2_Appli.elf` to address `0x00000000`, which appears incorrect for STM32N6 (should target OctoSPI flash via external loader). This also worked before the update.
---
Additional observation
During the generate step, `stedgeai` reports a shell execution failure:
```
error: implicit declaration of function '__DSB' [-Wimplicit-function-declaration]
```
This occurs in `ll_aton_cipher.c` when compiled with `LL_ATON_PLATFORM=LL_ATON_PLAT_SWEMUL` (missing CMSIS header). This error appears in both cases.
---
Question
1. Is the generated `STM32N657X0HXQ_LRUN.ld` missing memory region declarations (AXISRAM2–6, XSPI1/2, ROM) a known regression in the latest update?
2. What is the correct flash procedure for STM32N6 after AI Studio generates the project? Does the tool now require manual flashing with an external loader?
3. Is there a known fix or workaround for the CMSE stub placement error with larger float models?
I will attach the full build logs and model file.
Thank you.
