[Bug 166] New: u-boot cdc_acm hot un-plug/replug hang

bugzilla-daemon at bugzilla.openmoko.org bugzilla-daemon at bugzilla.openmoko.org
Tue Feb 6 02:22:00 CET 2007


           Summary: u-boot cdc_acm hot un-plug/replug hang
           Product: OpenMoko
           Version: current svn head
          Platform: Neo1973
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: u-boot
        AssignedTo: laforge at openmoko.org
        ReportedBy: laforge at openmoko.org

If you use u-boot cdc_acm on the Neo1973, then unplug the USB cable while some
stuff is printed to stdout, and then re-plug the USB cable, it is not working
very reliably.

Sometimes, stdin of u-boot is not working again.   Initial debugging shows that 

* the USB control endpoint enumerates cleanly
* the USB interrupt processing for incoming data (OUT endpoint) works
* somewhere in usbtty_poll, a data abort was caused and results in endless looping

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