On Tue, 6 Jan 2015, Michael Tessier wrote: > > > That is interresting, however, I have an older kernel running an OHCI > > > driver which is able to handle 4 codecs. Same usb hardware (codecs and > > > hub), but older kernel on a different CPU, with much less power. This > > > makes me believe that there's a solution to make it work... > > > > Of course there is: Install an OHCI host controller and use it to drive your codecs. It should work fine. > > > > The periodic scheduling algorithm for OHCI is very different from the algorithm for EHCI. > > According to your knowledge, how much time would you think it takes to > change the EHCI driver with an OHCI one? I don't understand the question. > And can you tell if the OHCI driver > will work on my hardware given that the Host controller of the i.MX512 is > a USB2.0 host controller? (OHCI was implemented for USB 1.x from what I > understand) The OHCI driver works with OHCI hardware and the EHCI driver works with EHCI hardware. OHCI is USB-1.1 and EHCI is USB-2. They are not interchangeable. > I tried to do so several days ago with the built-in configurator > (I am using "ltib"), but the configurator does not allow selecting the > OHCI driver; I tried manually but it turned into compiler errors... It looks like the configurator is smart; it won't let you select the wrong driver for your hardware. Alan Stern -- 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
