Hi there. I've got: - a Rock Pi 4 https://wiki.radxa.com/Rockpi4 - it has a type A port for otg (Ouch!) - it has an otg switch to set host or device mode (locked at device mode) - kernel v5.17.3 - dt overlay to set dr_mode=peripheral What I want: - use the Rock Pi 4 as gadget device - providing storage, whereof the target can boot from What works: - if the target is up, it'll see the gadget if I enable it (ls /sys/class/udc > .../UDC) What doesn't work: - if the target is up, just plug in the usb cable (new full-speed device, device descriptor read/64 error -71, ...) - boot from the gadget So, I was willing to capture trace events for plugging in the usb cable, but there're none. Though, trace events work in general as I get them, when I enable the gadget (target is up and write to UDC). Anything else I could try? Or could this even be a hardware limitation? Thanks, Daniel PS: I hope that wasn't to briefly.
