I've written a usb driver for an in-house i/o board that runs nicely, on UHCI, with most of the motherboards we have. The one motherboard we plan on shipping with, however, is an OHCI based mobo. An ASUS A8N-SLI nforce chipset. I know it's not the nforce4 chipset but I'm not sure if it's an nforce2 or not.
If I measure the time between insertion in the the descriptor queue for the controller and the interrupt completion, I see 3 milliseconds have passed. On the UHCI mobos, I consistently see 1 millisecond which is what I would expect. So, what is this delay I'm seeing? There isn't any debugging output to speak of here, nothing apparently unusual. I've looked at the two specs but there's no obvious reason for the two diffs that I found. I know I'm in clueless territory here, but I've reached the end of my brain stem and found a cliff. I'm using a 2.6.12.4 kernel but have tested with a 2.6,13 with the same results. I'm running tests now with a 2.6.15.6 kernel but my group has usurped the machine to install it into a car.
Any thoughts or ideas? Something to add to the brain stem? Bill Rees Perfect Line: Nascar Silicon Motor Sports ------------------------------------------------------- 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
