How to flash QSPI-Flash of STM32F746G-Discovery, or to create a binary file for ST-LINK
I think You can flash STM32F746G-Discovery QSPI-Flash, being STM32F746G-Discovery a commercial board, with STM32 ST-LINK Utility, maybe even with STM32CubeProg an all-in-one multi-OS software tool for programming STM32 products .
Giangiacomo