I'm struggling with this issue since a while and as the author of the USB-Serial module I thought experts here might provide some help... As it's a USB-serail issue, I've posted on both USB and Serial lists. thanks in advance! The problem is about connecting with a 3G USB modem, a ZTE MF-210 mini-pci board; plugged as a daughter board inside an Android tablet. I have posted already on a couple forums, but got no useful feedback yet. As soon as I power up the module I get the expected /dev/ttyUSB0-3 and that's fine, so far: <6>usb 1-1.1: new high speed USB device using emxx-ehci-driver and address 3 <6>option 1-1.1:1.0: GSM modem (1-port) converter detected <6>usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB0 <6>option 1-1.1:1.1: GSM modem (1-port) converter detected <6>usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB1 <6>option 1-1.1:1.2: GSM modem (1-port) converter detected <6>usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB2 <6>option 1-1.1:1.3: GSM modem (1-port) converter detected <6>usb 1-1.1: GSM modem (1-port) converter now attached to ttyUSB3 Issue is when I try to communicate with any of these ports. I can connect using picocom to all but can't receive any feedback from AT commands sent over to them. I made some partial progress only after using the "-i" option (i.e. "no port init"), but below you can find what I get if I simply type A + T + Z + <enter>, for example. As you can see, characters and commands are repeated several times. That's what I can't understand. Without the -i option, I don't even get any feedback from the modem and the same happens using other connection programs, e.g. busybox microcom. I'm using picocom as it's very small and I succesfully used it already in a similar case, though on a different Android platform and kernel. This Kernel is built including standard usb-serial options below: CONFIG_USB_SERIAL=y CONFIG_USB_SERIAL_WWAN=y CONFIG_USB_SERIAL_OPTION=y Is the kernel missing anything, or requiring some special ZTE-specific customizations in your opinion? What are the best connection options I could try? thanks -- 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
