On Monday 16 July 2007, Steve Calfee wrote: > I am working on a project using a generic (non-FPGA) cypress fx2 to > test host controllers. > > The good news is that Linux runs interrupt IN/OUTs at 3x1024 byte > packets uframe, 24MBytes per second, over as long as I have tested, > seconds. Verified by a bus analyzer.
Good! :) > The not so good news is that I have not been able to get high > bandwidth isoc to work. I am using a stock Ubuntu Feisty - 2.6.20.15 > kernel. I am going through usbdevfs. Not-so-Good ... :( > On INs I get two 1024 packets per uframe, and on OUTs one 1024 packet > per uFrame. It cannot be a device problem, because the host does not > ask for more. > > So my questions are has this been tested? Is it a problem with my > user mode program? Is my kernel too old? Should I keep looking for the cause? I don't recall testing high bandwidth ISO. In general, ISO support is pretty weak with EHCI ... ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
