On 09/06/16 06:47, Adrian Chadd wrote:
 missing some bus
barriers for ARM or something?

FYI: Most of the USB control and data memory is coherently allocated and don't need barriers. You can try capturing a trace using usbdump, of the traffic on your device, and see where it hangs:

usbdump -i usbusX -f Y -s 65536

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