Messages like this should always CC: the mailing list. On Tue, 22 Feb 2011, Flynn Marquardt wrote: > Hi Alan, > > some years ago I reported a problem consuming and now I ask with another > problem I have. > If you are not the right person, please tell me who I should ask instead. > > My problem: > > I use synce-hal (http://www.synce.org/moin/) to connect to Windows CE > devices through usb. > All works fine with older devices, that only have usb full-speed and on > the linux host e.g. the uhci_hcd > module is used: connection can be established and used. > > Newer devices have usb high speed ports and linux uses the ehci_hcd > module and the connection cannot be > "fully" established (connection is little bit tricky, details are here > http://www.synce.org/moin/TechnicalInformation/InitalConnection). > The needed pppd can be started and the ppp-connection can be > established, but the device cannot be 'pinged', > the Windows CE is waiting for some magic bytes, that do not arrive and > gets a timeout. > After unloading ehci_hcd (forcing full speed) these devices work fine too. > So this really a ehci related problem. > > Can this be fixed, so that synce also works with high speed? > In Windows all works fine with these devices using high speed. > I'll do any debugging, that is needed, sending usb-debugfs, usb-monitor > output, ... What version of the Linux kernel are you using? It would help to see usbmon traces for both a working full-speed connection and a non-working high-speed connection. 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
