At Tue, 14 Dec 2010 12:54:54 -0500 (EST), Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > It would be very interesting to test your device under Windows and > Linux on a computer with an OHCI controller instead of UHCI. With > OHCI, there is no way to tell the hardware to use slow transfers. Here are OHCI sniffs: http://arch.pp.ru/~sergej/files/usb-dumps/usb-dumps.ohci.tar.gz and unpacked: http://arch.pp.ru/~sergej/files/usb-dumps/usb-dumps.ohci/ On windows CSR based tool was used, on linux - dfu-util. OHCI results are interesting: it works with OHCI pcmcia controller: 02:00.1 USB Controller: NEC Corporation USB (rev 43) (prog-if 10 [OHCI]) Subsystem: Ratoc System Inc Device 0035 Flags: bus master, medium devsel, latency 64, IRQ 18 Memory at 30001000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 2 Kernel driver in use: ohci_hcd Kernel modules: ohci-hcd but does not with: 00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) (prog-if 10 [OHCI]) Subsystem: ASUSTeK Computer Inc. Device 807a Flags: bus master, medium devsel, latency 32, IRQ 9 Memory at d6800000 (32-bit, non-prefetchable) [size=4K] Kernel driver in use: ohci_hcd Kernel modules: ohci-hcd Also it works through external USB HUB. I analized logs and found that problems start on speed 64bytes packet per ~0.000055sec. Visible difference between - ich4 uhci - ich4 uhci with fixed driver - nec ohci - sis ohci - sis ohci + external hub is transfer speed. -- 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
