Re: i.MX21 USB driver - hub 1-0:1.0: Cannot enable port 2. Maybe the USB cable is bad?
Alan Stern <[email protected]>
| Newsgroups | gmane.linux.usb.devel |
|---|---|
| Message-ID | <[email protected]> |
On Wed, 3 Oct 2007, Midhun A wrote: > Hi, > > > The USB spec won't help; it's too general. You need to know the > > details of the behavior of the imx21. If you can hook up an > > oscilloscope and watch the signal levels change, that might give you > > some ideas. It could be something as simple as a bad capacitance. > > I was going through the schematic of our board and found that there > is no capacitance present in the connections between i.MX21 - USB > Trancevier (PDIUSBP11A) - USB Host Socket. So is the hardware missing > something? Or are you talking of bad hardware design of our board > which causes some bad capacitance? I don't know. You should read the USB specification to see what is needed; I'm not an expert on low-level electronics. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel