Messages in this thread | | | From | David Brownell <> | Subject | Re: usb detecting only high speed devices only - not detecting low speed devices | Date | Mon, 3 Mar 2008 11:07:36 -0800 |
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On Monday 03 March 2008, mahendra varman wrote: > > > > Now as to *why* that happens, I don't know. We've certainly had folk > > using Philips/NXP EHCI controllers successfully before. Maybe this > > board has a hardware problem, like a bad chip or not having wired > > up the power lines that OHCI controller uses. > > still the low speed devices are giving unlink after no IRQ..
Not at all surprising if you haven't changed anything.
You *did* verify this happens on all the ports of that chip?
> My > hardware engineer says he followed the reference schematics of ISP1562 > of philips. He says that ohci side, the power lines are wired up > > My Ehci devices can be mounted and the files are read > Today I faced another issue > For some usb ehci devices its giving "device descriptor read/64, error > -71" ( for some usb stick of usb2.0) > but for others i can able to mount without this error..... > > Sir, Any clue regarding the above problem iam facing currently ??
I gave you all the clues I've got. You're the one with the uniquely mis-behaving hardware...
Time for you to work harder at debugging your problem. You have the hardware, the software source code, a cooperative hardware engineer ... that's a lot more than most folk have when they start to chase down problems like this.
- Dave
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