Quoting Eberhard Fahle <[EMAIL PROTECTED]>: >> I've compiled the kernel enabling cp2101.ko as a module and loaded it >> on a Fox; when I plug in the reader, dmesg shows me a few errors > Could you post the errors, please?
Of course. Here's an excerpt: ----------------------------------------------------------------------- crisv10_irq dbg: ctr_status_irq, controller status: host_mode started crisv10_irq dbg: ctr_status_irq, controller status: host_mode started running usb 1-1: new full speed USB device using hc-crisv10 and address 13 cp2101 1-1:1.0: cp2101 converter detected usb 1-1: reset full speed USB device using hc-crisv10 and address 13 crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[187] crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[188] crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[189] usb 1-1: device descriptor read/64, error -71 crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[190] crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[191] crisv10_irq warn: 3rd error for epid:0 (in ctrl) URB:0xc0445b40[192] usb 1-1: device descriptor read/64, error -71 crisv10_irq dbg: ctr_status_irq, controller status: host_mode crisv10_rh: Physical port 1 disabled crisv10_irq dbg: ctr_status_irq, controller status: host_mode started crisv10_irq dbg: ctr_status_irq, controller status: host_mode started running hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad? crisv10_irq dbg: ctr_status_irq, controller status: host_mode crisv10_rh: Physical port 1 disabled crisv10_irq dbg: ctr_status_irq, controller status: host_mode started crisv10_irq dbg: ctr_status_irq, controller status: host_mode started running hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad? crisv10_irq dbg: ctr_status_irq, controller status: host_mode crisv10_rh: Physical port 1 disabled crisv10_irq dbg: ctr_status_irq, controller status: host_mode started crisv10_irq dbg: ctr_status_irq, controller status: host_mode started running hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad? crisv10_irq dbg: ctr_status_irq, controller status: host_mode crisv10_rh: Physical port 1 disabled crisv10_rh: Physical port 1 disabled usb 1-1: cp2101 converter now attached to ttyUSB0 usb 1-1: USB disconnect, address 13 cp2101 ttyUSB0: cp2101 converter now disconnected from ttyUSB0 cp2101 1-1:1.0: device disconnected ----------------------------------------------------------------------- The same dmesg block seem to go on forever. > The USB root-hub is required to deliver 500mA on each of the two ports. > I run several devices requesting 500mA without problems. > You could put a self-powered USB-hub, inbetween the foxboard and the > device to test your power-problem theory. I'll try it ASAP. Thanks a lot, Ant9000
