On Fri, Jul 8, 2011 at 10:16 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Fri, 8 Jul 2011, yingchun li wrote: > >> On Thu, Jul 7, 2011 at 11:07 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> > On Thu, 7 Jul 2011, yingchun li wrote: >> > >> >> Hi, >> >> I have a full speed device, and insert it to a highspeed host, then run >> >> the usbmon just like Documentation/usb/usbmon.txt say. but I cannot >> >> capture any log with my device. if I config my device with high speed, >> >> I can capture the log well. >> >> so, does usbmon not support full speed device? >> > >> > usbmon _does_ support full-speed devices. Are you certain that you >> > followed the instructions correctly? Did you monitor the correct bus? >> Thank you Alan, you are right, I use the wrong bus number. but I am not >> clear why the bus number is changed, for when I config my device with >> high speed, the bus number is 1, after config the device with full speed, >> the bus number changed to 2? I inserted the device to the same port. > > The USB port is connected to two different controllers. One of those > controllers is used for high-speed devices and the other is used for > full/low-speed devices. Since each controller is registered as a > separate bus, the device will show up with a different bus number > depending on its speed. I get it, Thank you, Alan. > Alan Stern > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
