On Sun, 12 Nov 2006, t-bow wrote: > Hi everybody, > > I have a problem with a flash cards reader. This reader is supposed to > be USB 2.0 compliant. But the USB cable seems to be an USB 1.1 (the > connector on the reader side is a little flat one : I don't know if it's > significant ?). The reader is recognized anyway as an high speed device, > and is thus managed by ehci_hcd module. But the problem is that I am > spammed with the following message "usb 1-2: reset high speed USB device > using ehci_hcd and address 3". What seems to be because the device is > not able to really support high speed protocol. And it is not surprising > me, since the cable seems to be an USB 1.10 one. > It doesn't matter : I would like this device to be managed by OHCI : my > USB 2.0 PCI card has two OHCI companions (if my understandind of the > "lsusb -v" output is good). > > I would like to know how to make my reader beeing managed by one of > these OHCI companion ? even if the reader is supposed to be an USB 2.0 > device (I have no need to use it with high speed performance) > > Here is additionnal information on my system (for better understanding, > my reader is the Alcor Micro Corp. As you can see, I also own a LaCie > external USB 2.0 hard disk, which is doing quite well, even if I'm not > completly happy with its performance. At least, this last device is not > spamming my log !)
There are a few things you can do. One is simply to rmmod ehci-hcd, thus forcing everything to use the companion controller. Of course that will slow down access to the LaCie disk, which you probably don't want to do. Another possibility is to buy a USB 1.1 hub and plug the Alcor reader into it. The hub will run at full speed, forcing the card reader to do the same. There are some experimental patches which allow the user to specify that the EHCI controller shouldn't manage certain ports. They'll probably get into the kernel somewhere in the 2.6.21 time frame. You might be able to find older versions of those patches by searching the mailing list archives. Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
