On Sunday 17 April 2005 8:10 am, Alan Stern wrote: > On Sun, 17 Apr 2005, Mike Lee wrote: > > > When i debug between with my FC3 linux PC, i found that it keep > > asking the device for the DEVICE_QUALIFIER descriptor which only > > support in USB2.0 .I finally change all the gadget driver bcdUSB to > > 0x110 to make the host stop asking for any USB2.0 request. Is there > > any better method to do that? > > ... > To answer your question: If a gadget driver doesn't support USB 2.0 -- > including GET_DEVICE_QUALIFIER -- then it shouldn't set bcdUSB to 0x0200.
Not so. It's perfectly reasonable to have a USB 2.0 device that doesn't support high speed ... and only devices that can run at high speed may provide a device qualifier. High speed support is an optional part of the USB 2.0 spec. My question is different: why do you care if the host is asking for that (or any other) descriptor? If that causes any problem whatever, it's a bug in your controller driver. If it doesn't cause any problem, there's nothing to worry about. - Dave ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
