I'm using an NXP 1760 device with the latest isp1760-hcd driver on both a Blackfin BF537 DSP and also a PowerPC 405 (Virtex4). Both platforms have some problems with accessing highspeed devices. The PowerPC in particular is completely unable to access any highspeed device, producing error messages as below: error bit is set in DW3 error bit is set in DW3 error bit is set in DW3 usb 1-1.2: device descriptor read/64, error -32 Full speed transfers to the same device (forced by putting a full- speed-only hub in the chain) work 95% reliably. Occasionally I've seen hangs during device connect/disconnect. I've tried a variety of devices; various memory sticks, card readers and hubs. All fail with the same errors. I've tried adjusting the bus timings, giving very relaxed timing compared to that indicated in the NXP datasheet (eg 64ns write cycle, rather than 35ns required) -- this helped to make things work much more reliably on the Blackfin board, but hasn't really helped at all on the PowerPC board. I believe the hardware on my Blackfin board, at least, is perfectly fine, as the old pehcd isp1760 driver worked perfectly fine there. I'd be tremendously grateful for any suggestions for debugging this problem, and/or information about the known reliability of high-speed transfers with the isp1760-hcd driver. Many thanks, Ian Jeffray -- 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
