[Thread moved to linux-usb-devel, which seems more appropriate] On Wed, 21 Jun 2006, Maulik Mankad wrote:
> Hello Alan, > > I am a member of the Linux usb user group and am very new to USB device > drivers > and USB specifications. > > I am working on USB host driver porting for Intel's IXDP465 network processor. Good for you. It's not an easy job... > I am using Snap gear Linux Kernel 2.6.12, which runs on IXDP465. > > I am facing the following issues: - > > (1) The USB bus enumeration does not complete fully. The request for getting > the > device descriptor fails with timeout error. > "device descriptor read/64, error -110" > > (2) My USB host controller is EHCI compliant. Although it supports only full > and > low speed mode. There are neither transaction translators nor companion > controllers available with the USB host. This sounds backward. EHCI supports only high speed, not full or low speed. If the host doesn't have full-speed capability then it is not USB-2.0 compliant. > (3) I have ported the host driver using the host controller registers. The > host > gets initialized properly and I do get interrupts on plugging / unplugging of > a > USB device (pen drive) to the device port. I also do get the SOFs occurring > down the enabled port. > > (4) The asynchronous schedule also executes properly as I get interrupts for > asynchronous schedule advance. > > (5) The host is not able to set the address of the device. This request also > times out with error "usb 1-1: device not accepting address 3, error -110". > > The request for the device descriptor and SET_ADDRESS gets submitted properly > in > the queue. But somehow the timer times out and a function timeout_kill () gets > called. This function then > calls a function usb_unlink_urb (), which aborts the request and removes it > from > the queue. Does any one know why this can happen? Certainly. The timer expires because the request doesn't complete quickly enough. Probably because a bug in your driver prevents the request from completing at all. What does a bus trace reveal? > Can anyone let me know what can be the issue in this case? I am struggling > with > the above issue from three weeks now. Also has anyone worked with IXDP465 USB > host controller? > Please share your experience. > > Please let me know if you need more details. > > Thanks, > Maulik Mankad Alan Stern _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
