[OpenOCD-user] STM32F3 - 'flash write_image' failed with error code -4. Flashing with STM32CubeProgrammer works.

[Paul Rothhammer-R. <Pau...@lu...>]

Hello OpenOCD developers,

I am using OpenOCD version 0.12.0 on a windows machine (openOCD is running on MSYS2). I have successfully used openOCD for years. Recently when using an STM32F334 (64KB flash size), I am occasionally getting  errors when flashing. The error message is: "Error: error writing to flash at address 0x08000000 at offset 0x00000000." This error seems to be binary file dependent. Flashing will immediately work again on openOCD if I switch over to flashing a "known good" binary file. In fact, I can often get a problematic binary file to flash successfully if I delete random lines of code in the file.
I would think the issue is the size of the binary file, however, I am able to successfully flash the "bad" binary file using the STM32CubeProgrammer. I confirmed this by doing a simple LED blink program; it would not flash with OpenOCD but LEDs did blink once I tried with STM32CubeProgrammer. When using the size utility (arm-none-eabi-size) I get text=12652, data=120, bss=1696, dec=14468. I should have plenty of space left on the STM32F334. I am using default the default linker script generated by the STM32CubeProgrammer.
When I enable a verbose output on OpenOCD, I see the following error message:
"Error: 596 2811 core.c:96 flash_driver_write(): error writing to flash at address 0x08000000 at offset 0x00000000
Debug: 597 2815 command.c:545 run_command(): Command 'flash write_image' failed with error code -4"
Please advise how I can best troubleshoot this issue. I rely on OpenOCD for flashing and debugging.
Thank you in advance!

Regards,
Paul


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