Can SPI-Flash be programmed by USB via CubeProgrammer ?

[rogerhuang]

If I use CubeProgrammer to connect the internal boot loader of STM32H750XBH6 via USB (pull Boot-0 high), can I program the external SPI Flash through CubeProgrammer? I know it's possible to do this using ST-Link (ps. by stldr) directly, but I can't do it using USB by similiar way.

[Aziz BRIGUI · Accepted solution]

Hello @rogerhuang,

This use case is not supported with the STM32 internal bootloader, so I suggest developing your custom USB bootloader to support the SPI flash. You can refer to AN3156 and the open bootloader middleware for guidance.

Aziz

[Tesla DeLorean]

No

But in lieu of an external loader you could implement a USB-DFU device capable of describing all the memories in the system and facilitating the use of STM32 Cube Programmer. 

The alternative on say a H750 with limited internal Flash is to be a USB-MSC and allow for drag-n-drop, there should be code from Microsoft and Arduino implementing such methods as UF2 or whatever. I've build things where QSPI, or a portion, is used as a direct MSC volume, the loader can then recover files by name to perform updates into the active / code portion of the QSPI