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DrAzzy
Thank you for the reply; its good to know which thing not to chase sometimes. I assume that making sure the board is not running at 16 MHz will also be critical to getting the USB working correctly. My goal is to get something running with an "Arduino Yun Shield" that is gathering dust; this requires that the serial port be on the shield connector rather than the ST-Link side. Trying to have a functional USB console after moving the jumpers around. Time to bite the bullet and set up a build environment.
Chris Z
ChrisZ
@DrAzzy
The F401 builds are not built with USB support enabled, neither Gordon's nor my nightlies. I think the decision was made because the board did not break out the pins to a USB connector. You could try building the firmware yourself with that enabled though, and seeing if it worked.
I downgrade the STLink firmware on my Nucleos so drag+drop works again.