STM32H745 stuck waiting for M4

jgauthier · ‎2022-04-29

I just got started with a dual core STM32H745. I put together a quick project with CubeMX to test some FDCAN interfaces. I built the program and ran it.

I'm using Keil ARM MDK. After building, and connecting it appears to connect to the CM7 (which is fine, because that's what I wanted anyway) - but I don't get far after that.

There is some code to wait for CPU2 (CM4) for boot:

  /* Wait until CPU2 boots and enters in stop mode or timeout*/
  timeout = 0xFFFF;
  while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) != RESET) && (timeout-- > 0));
  if ( timeout < 0 )
  {
  Error_Handler();
  }

This never completes. I'm not really sure what to do with this.

Sara BEN HADJ YAHYA · ‎2022-05-09

Hello @Community member ,

Thanks for your feedback,

Please check this AN5286 on dual core debugging, it is very helpful. You can find in Section 5, MDK-ARM dual debugging.

About the BOOT_CM4 option bytes (BCM4) and CM4 boot address (BOOT_CM4_ADD0 and BOOT_CM4_ADD1), you can set them correctly using STM32CubeProgrammer.

At the moment BOOT_CM4_ADD0 and BOOT_CM4_ADD1 cannot be changed with CubeProgrammer. It is a known bug and the dev team is working on it.

So I advice you to connect your board with STLink Utility (a Legacy tool and now replaced by CubeProgrammer but still used and can be downloaded from this Link) and change the addresses.

I hope this helps 😊

If your issue is solved, please close this post by clicking the "Select as Best" button. This will help other members of the community find this response more quickly 🙂

Sara.

View solution in original post

TDK · ‎2022-04-29

is BOOT_CM4 enabled in option bytes? Is the CM4 code flashed and functioning correctly? Is the CM4 boot address set to where it needs to be?

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jgauthier · ‎2022-04-30

Those are all really good questions. I'm trying to find the answers in Arm MDK, because I don't know.

Sara BEN HADJ YAHYA · ‎2022-05-09