On Thu, 2006-12-07 at 12:18 +0800, Yu, Xiaoyang wrote: > After add a USB device by “usb_add”, I can view it by “info usb”. It > shows the bus number and address. > > > > As shown in vl.c, it seems that usb_info() is called when issue “info > usb”, and usb_device_add() is called when issue “usb_add”. > > > > But if I add call to usb_info() in the end of usb_device_add(), it > always show the bus number and address as “0.0”, which can be > different from the output of “usb_add”. > > So it seems like the bus number and address of a USB device changed > some time after “usb_add”. Does anyone know why it changes? Thanks in > advance!
The address you see with the monitor command "info usb" is the address all usb devices start out with when connected to the guest. The guest os will later assign the device an address on bus 0 (the uhci controller on the i386 system target) after it does things like fetch the device descriptor, configuration, etc. iirc linux will first assign a device an address unlike windows which queries for the configuration information before an address is assigned. _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
