Guidance required for developing a custom External Loader (.stldr) for STM32N6570-DK with S25FS512S QSPI Flash

[Pratik Savle]

Dear STM Support Team,

I am working on a custom hardware platform based on the STM32N6570-DK.

We have replaced the default MX66UW1G45G Octal SPI NOR Flash on the evaluation board with an Infineon S25FS512S Quad SPI NOR Flash. Since the default external loader is designed for the Macronix Octal flash, STM32CubeProgrammer is unable to program the new flash device.

We would like to develop a custom External Loader (.stldr) for the S25FS512S. However, we are unable to find the source code or documentation specific to the STM32N6570-DK external loader.

Could you please clarify the following?

1. Is the source code for the STM32N6570-DK External Loader (MX66UW1G45G_STM32N6570-DK.stldr) publicly available?
2. If yes, where can it be obtained?
3. Is there any application note or documentation describing the API and project structure required to develop an External Loader for the STM32N6 series?
4. Are there any reference projects or examples for creating a custom .stldr for STM32N6 devices?
5. If the source is not publicly available, what is the recommended approach for supporting a different external NOR flash such as the S25FS512S with STM32CubeProgrammer?

Our objective is to enable programming of the S25FS512S through STM32CubeProgrammer while continuing to use the STM32N6570 platform.

Any guidance or reference material would be greatly appreciated.

Thank you for your support.

Best regards,

Pratik Savle