I'm trying to transfer data across a USB port via g_serial (on gadget side) and cdc_acm (on host side) but I'm seeing some strange behavior and I want to get some advice on where I can start looking. This is on an MPC8313 based system running the latest kernel. I have written a pair of applications that open each device (ttyGS0 and ttyACM0) and transfer data back and forth. However when I'm running the apps the gadget side will send (or think it sent) all appropriate data to the host side, but the host will only receive part of the transmission and time out in the select() call. I am not seeing any errors from the gadget side kernel but occasionally this will lock up my host system. Small data transfers of around 200 bytes or less seem to work fine, but when I try larger transfers (1k or greater) I will see it fail (timeout in select()). I know that my data transfer 'protocol' works as it works great over ethernet and fsl-usb2-udc seems to work fine also as I can do this using g_ether, but I'm not sure whether this is a problem within g_serial, its interface with fsl-usb2-udc, or my setup of the tty device in the applications. I've tried a ton of different configurations with the termios structure but haven't seen this work reliably. Thanks for your feedback and let me know if you need more information about the problem. Ron -- 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
