On Fri, 13 Aug 2010 21:49:31 -0400 (EDT), Alan Stern wrote: > On Fri, 13 Aug 2010, Dennis Nezic wrote: > > > My usb2.0 multi-card reader, 058f:6366 Alcor Micro Corp., with > > vanilla kernel 2.6.35.1, doesn't seem to work with ehci_hcb. It > > does work with ohci_hcb, so I don't think it's a hardware problem > > necessarily? > > > > Here is my syslog when using EHCI: > > http://dennisn.dyndns.org/guest/pubstuff/ehci-bug/ehci-fails.log > > > > Here is my syslog when using OHCI: > > http://dennisn.dyndns.org/guest/pubstuff/ehci-bug/ohci-works.log > > > > The main differences that I notice are many "detected XactErr"s with > > ehci, but they don't seem to be too critical, until they (seem to) > > cause: > > > > 09:14:30 kernel: ehci_hcd 0000:00:13.2: devpath 8 ep2in 3strikes > > 09:14:30 kernel: usb-storage: Status code -71; transferred > > 76288/98304 09:14:30 kernel: usb-storage: -- unknown error > > 09:14:30 kernel: usb-storage: Bulk data transfer result 0x4 > > 09:14:30 kernel: usb-storage: -- transport indicates error, > > resetting > > > > ... which seems to happen with "usb_stor_bulk_transfer_sglist: xfer" > > greater than about 512 bytes? (The transfers seem to complete with > > smaller xfers?) > > > > Ideas? Suggestions? > > You probably have a bad electrical cable connection. It's good > enough to work at full speed with OHCI, but it's marginal at high > speed with EHCI. You get occasional errors, and eventually the > errors become too numerous for the system to handle. Nope. Works fine in MSWindow$. -- 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
