Hi > hub was self powered, it indicates either your device took > too much VBUS current, your host could not supply enough vbus > power, your host transceiver has a problem, OR you have a > major fussy device in receiving data.
We have couple of other 1.1 devices who works with our system in bus powered mode. Obviously for such devices, the host could supply enough vbus power and host transreceiver did not have any problem. > What did your bus analyzer say in this case? Full speed is > much more forgiving than high speed. The analyzer indicated that the device failed to generate ACK for certain CBW (31 byte OUT transaction) three times in row. That caused ohci driver to reset the device. Thanks > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of Steve Calfee > Sent: Monday, September 25, 2006 4:33 PM > To: linux-usb-devel@lists.sourceforge.net > Subject: [linux-usb-devel] FW: Fwd: Re: USB DISK does not work > > >> > This indicates that the problem is a small hardware > >> > incompatibility, > >>as I have said before. > >> > >>We attached a High Speed hub to our system and inserted > this disk in > >>the hub. The device works perfectly in such mode. > > This is more than a small hardware problem. Assuming this HS > hub was self powered, it indicates either your device took > too much VBUS current, your host could not supply enough vbus > power, your host transceiver has a problem, OR you have a > major fussy device in receiving data. And even with this test > info I have to assume that you used the same cable (a possible > failure) between the good hub and the root hub. > > >> > >>We also attached a Full speed hub (used in both bus and self powered > >>mode) to our system and inserted this disk in the hub. The device > >>fails to work in such mode. The reasons for device failure are > >>identicle to case when it is directly connected to our system. > > What did your bus analyzer say in this case? Full speed is > much more forgiving than high speed. > > I have seen a high speed mass storage device which would fail > during enumeration in full speed (a small percentage of the > time). HS is supposed to fall back to FS for all usb 2.0 > devices, but it does seem that occasionally some devices are > not 100% compliant :) > > > > >> > >>The above experiments do not indicate hardware > incompatibility. Do you > >>agree ? > >> > > Not in my opinion, this seems likes a major hardware problem > somewhere. > > Regards, Steve > > > > -------------------------------------------------------------- > ----------- > Take Surveys. Earn Cash. Influence the Future of IT Join > SourceForge.net's Techsay panel and you'll get the chance to > share your opinions on IT & business topics through brief > surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge > &CID=DEVDEV > _______________________________________________ > linux-usb-devel@lists.sourceforge.net > To unsubscribe, use the last form field at: > https://lists.sourceforge.net/lists/listinfo/linux-usb-devel > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
