Dave: Here are the results from a few tests of my net2280 card, fresh as of this afternoon.
(1) Testing with a Beagle analyzer showed that when running at full-speed, the net2280 always finishes a transfer on ep0 by NAKing the first status-stage transaction and sending the expected packet the second time. This is odd because the transfers were running without FSBR, so there was only one transaction per frame. The net2280 therefore had a millisecond to prepare for finishing the transfer, which should have been plenty of time. This was all stuff like descriptor fetches, nothing fancy. (2) Editing zero.c to set various string descriptors to exactly 31 bytes showed that the net2280 did not respond correctly after all the data had been sent. A Get-String-Descriptor request for 255 bytes transferred 64 bytes in the first Data packet, and after that the net2280 NAKed all further IN packets until the transfer timed out. I verified this directly using the Beagle analyzer at full speed; at high speed usbmon showed the same results. (3) After timing out on the Serial number descriptor transfer, Linux does a Get-Device-Status, which is a 2-byte transfer. The data was transferred correctly, but again the net2280 NAKed the status stage until the transfer timed out. Oddly enough, when I changed the Manufacturer string (which is fetched immediately before the Serial number string) to be 31 bytes long so that it timed out, and made the Serial number either 30 or 32 bytes, the Serial number transfer proceeded correctly. Clearly something is not working right. However I have no idea where to look or what to change in the driver. Alan Stern ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
