David Brownell wrote: > On Friday 30 June 2006 10:14 am, Paulo Marques wrote: > >> However, using the EHCI controller gives a lot of errors running this >> simple script: > > This is with 2.6.17-git, I hope?
This was with the latest stable, 2.6.17.2. I can't believe I left out the kernel version information :P > You should try some isolation testing, for example trying this > stress test with just one pl2303, just the ftdi, then two pl2303, > then one each, and so on ... to find some change which starts > triggering the strange behavior(s). Then work on providing some > good characterization of what you're reporting. Ok, 1 and 2 pl2303 seem to work, but if I use 3 pl2303 it already gives errors. Even simply inserting the third pl2303 with the hub connected failed at one point. Disconnecting and re-connecting the hub with the 3 devices already plugged on the hub seems to work, though. I've removed the ftdi from the equation for now to simplify testing. > Those errors look like peripheral devices that stop responding; > can you put any kind of sniffer (Beagle, oscilloscope, etc) on > the wire to verify what's going on at a low level? My first guess was that this had something to do with split transactions. A problem similar to what's reported here: http://marc.theaimsgroup.com/?l=linux-usb-devel&m=112144353807629&w=4 I'm CC'ing Dan Streetman to see if he found out something that could help on this thread. I don't have real hardware that can be used to debug this. I did turn on usb monitor and debugfs. Would a trace from usbmon help? Anyway, I'll be testing with the latest 2.6.17-git21 and there is a new USB_EHCI_TT_NEWSCHED that seems to address exactly this problem. I'll report again after the tests. -- Paulo Marques - www.grupopie.com Pointy-Haired Boss: I don't see anything that could stand in our way. Dilbert: Sanity? Reality? The laws of physics? 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
