On Tue, Mar 11, 2014 at 12:43 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 11 Mar 2014, David Mosberger wrote: > >> So I hooked up a Seleae Logic and I still can't find anything obvious >> that's wrong. I attached the decoded USB trace for the last WRITE10 >> request that's ends up with "infinite" NAKs. >> >> After receiving 8 contiguous NAKs, my driver prints some kernel >> messages and a command log trace, so that's why after the 8th NAK you >> see nothing more going on. In reality, the OUT commands keep getting >> NAKd after the kernel messages are printed. >> >> From what I can see, usb-storage sends a valid WRITE10 command >> indicating that it will write 61440 bytes. > > Actually it says that it will write 122880 bytes. Ah, OK. >> After ~147x 64-byte writes >> (~9408 bytes) the NAKs start. Previous WRITE10s with same length work >> fine. >> >> Anybody sees anything wrong in this trace? > > It looks like the host controller is behaving correctly, which means > the fault is in the device. Have you tried plugging this device into a > regular Linux PC and running the same test? Yup, works fine at least at least at hispeed. I suppose I should try the "enable UHCI only" trick to see if I can test the device at full-speed on my computer. --david > Alan Stern > -- eGauge Systems LLC, http://egauge.net/, 1.877-EGAUGE1, fax 720.545.9768 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
