Hi, > > Most likely the root cause is a hardware bug in the Atmel G45. > > However the only way to prove this would be to replace the G45 with a > > different kind of system. I think I found something on this : The G45 has a 2 port USB host and 1 USB device connection. The device connection gets enabled by setting EN_UDPHS. Linux reports at startup : hub 1-0:1.0: 2 ports detected. Once Linux is started I start my gadget device driver. This enabled USB device and I suppose it would disable port 2. Starting USB device earlier than host doesn't change anything. Port 1 is in use, port 2 is not. It is at least not accessible from outside the G45. I don't see how to disable it in the G45 spec though. It just speaks about enabling USB device. Anyway, if it's still active in the G45 but not accessible from outside I guess it could be considered a bug in the hardware. Is there a way to disable port2 in Linux ? While I communicate over the USB device, I receive the following : hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004 atmel-ehci atmel-ehci: GetStatus port 2 status 001803 POWER sig=j CSC CONNECT hub 1-0:1.0: port 2, status 0501, change 0001, 480 Mb/s usb 1-2: USB disconnect, address 2 usb 1-2.1: USB disconnect, address 4 usb 1-2.1: unregistering device usb 1-2.1: usb_disable_device nuking all URBs usb 1-2.1: unregistering interface 1-2.1:1.0 Line 3 seems to indicate a change on a port that I don't use or I'm misinterpreting the message. btw, I have a way to replace my g45 by another MCU. If I get nowhere tomorrow with this, I will order one and try it. Best regards, Marcel -- 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
