but it is high speed and i have tested with other kind of devices like webcams and the enumeration fails also... i think that if an usb 2.0 device that have more than one endpoit is connected directly to the EHCI usb host port it will fail!
On Dec 18, 4:43 pm, Steve Sakoman <sako...@gmail.com> wrote: > On Sat, Dec 12, 2009 at 8:25 AM, Nuno Felicio <nuno.feli...@gmail.com> wrote: > > For a real test just do this: put an normal USB2.0 device that have > > more than one endpoint directly on the HOST port(ex: an usb Bluetooth > > dongle ), no HUB (the USB hubs hide the problem!!), typically the > > enumeration of the device fails!! > > Remember that the EHCI port is high speed only! > > If your Bluetooth dongle is not a high speed device, you *must* use a > hub or the device will not be enumerated. > > Steve > > > > > I really like the OMAP3 but im shocked with the problems in the USB > > HOST port, TI is doing a really poor job in this part... > > > One more thing... for the ppl that have problems with webcams, > > typically corrupted frames... I suspect this is caused by the same > > problem that causes problems in enumeration ... > > > Nuno > > > On Dec 11, 1:04 pm, Gerald Coley <ger...@beagleboard.org> wrote: > >> This is a noise issue on the 1.8V IO rail and is due to the fact that the > >> PHY does not like frequencies in the 400HZ to 4MHZ range. The switcher on > >> the VIO_1V8 rail is 3.6MHZ. The solution is to isolate the 1.8V rail on the > >> PHY from the main 1.8V rail. > > >> Oh, and I am the designer of the BeagleBoard. This issue has been fixed on > >> the rev C4 board using the above described method. > > >> One additional note. I have seen cases where if the USB PHY and the > >> BeagleBoard are not plugged into the same outlet or power strip and > >> depending on the quality of your supplies, a ground loop can exists which > >> can also cause additional USB issues. > > >> Gerald > > >> On Fri, Dec 11, 2009 at 6:53 AM, Stan-Dave <wizard.s...@gmail.com> wrote: > >> > Well this is interesting. > >> > After the fix, dd test runs fine. > >> > After a couple of days, however, things go strange. > >> > I've got a powered USB hub plugged into my BeagleBoard, and wireless > >> > ethernet plugged into the hub. Before, when the USB host would crash, > >> > it would just die: lsusb returned just the two basic lines with no > >> > extra devices, and plugging and removing devices made no change and > >> > nothing appeared in dmesg. > >> > Now my ethernet dies, but lsusb still says everything is there. If I > >> > attempt to bring up the network, it fails with a bunch of errors. > >> > Here's the strange part: I can plug in a thumb drive and run the dd > >> > test just fine still; unplug, replug, dd, back and forth, no problems. > >> > But if I unplug my ethernet, then the whole thing becomes unstable > >> > again: plugging anything else in after removing the ethernet causes > >> > the EHCI to crash in the same way it used to; no disconnect/reconnect > >> > notice, nothing reported in lsusb, just dead. Only way to recover is > >> > a complete reboot. > >> > I believe I may actually have had two problems, one exacerbated by the > >> > other. Now that I think about it, even back before the fix, it would > >> > die in this manner every 2 days or so. Since the dd test consistently > >> > caused it to crash, I just chalked it off to the USB problem. Now, > >> > I'm suspecting I had a different problem with my ethernet which may > >> > have looked like or triggered this other USB error. The fact that, > >> > once it starts having problems, I can make the USB crash again > >> > suggests a rather close tie in. > >> > I need to do some more tests, but since I only get one shot to test > >> > something every 2 days, it could take a while to figure out exactly > >> > what's going on, unless someone smarter than I am has a suggestion. > >> > The error log when I try to bring up my ethernet is at > >> >http://www.rebirthofxeen.com/dmesg.log > >> > Anywho, I just wanted to say that the fix does seem to have mostly > >> > worked; hitting the USB hard with dd seems to work, but there may be > >> > other problems which can trigger it. I should know more in couple of > >> > days. > > >> > -- > > >> > You received this message because you are subscribed to the Google Groups > >> > "Beagle Board" group. > >> > To post to this group, send email to beagl...@googlegroups.com. > >> > To unsubscribe from this group, send email to > >> > beagleboard...@googlegroups.com<beagleboard%2Bunsubscribe@googlegr oups.com> > >> > . > >> > For more options, visit this group at > >> >http://groups.google.com/group/beagleboard?hl=en. > > > -- > > > You received this message because you are subscribed to the Google Groups "Beagle Board" group. > > To post to this group, send email to beagl...@googlegroups.com. > > To unsubscribe from this group, send email to beagleboard...@googlegroups.com. > > For more options, visit this group athttp://groups.google.com/group/beagleboard?hl=en.