On Tue, 2 Apr 2013, Yegor Yefremov wrote: > I'm making a burn-in test (see serialtest.py > http://pastebin.com/pz47gaar) for our devices, that have built-in FTDI > chips. If FT2232C is attached directly to the USB host controller > port, the tests run properly. If I connect the chip to a USB-hub some > of the tests show timeout errors (read() routine). On the newer host > with USB3.0 this issue occurs on all USB ports where I attach FT2232C. > I tried kernels 3.2, 3.5 and 3.8. > > The test procedure opens two ports, exchanges data and closes ports. > If I don't open/close ports I don't encounter this issue. > > The FT4232H has no problems whether I attach it to USB HC or via HUB. > Any idea how to workaround the problem? If you use a different type of hub, does the test work? 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
