On Mon, 27 Jun 2005, Dag Nygren wrote: > Hi again, > > remember me with the USB memory problems? > > Anyway I studied a little of the USB specs and have a question: > > All the problems seems to occur after a report back from the > USB controller with the cc register set at 6. This means that > the controller detected a PID check error. If I read the specs right > this transfer should then be retried (by the USB layer I presume) > and not reported back as failed to upper layers. Am I right?
I'm not very familiar with the OHCI spec, but if you're seeing a PID check error then probably the transfer _was_ retried already (by the hardware). It has to be reported as failed to the upper layers if the PID check occurs every time the transfer is retried. > Additionally there really seems to be (as you pointed out) problems > in the whole SCSI (and possibly USB) layer in the way it handles > error conditions. There definitely are some bugs in the SCSI layer. They are being worked on. Alan Stern ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
