Source code of external loader
Where can I find source code of external loader (.stldr) for STM32 devices?
GitHub Repository
ST GitHub repository contains dedicated folder for external loaders. There are many projects for ST evaluation boards and memory sales types.
Repository link is:
https://github.com/STMicroelectronics/stm32-external-loader
MOOC - education
Additionally, you can visit ST education material - How to create an external QSPI loader MOOC.
MOOC link is:
https://www.st.com/content/st_com/en/support/learning/stm32-education/stm32-moocs/external_QSPI_loader.html
