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Exar USB Serial Driver ====================== Version 1A, 1/9/2015 This driver will work with any USB UART function in these Exar devices: XR21V1410/1412/1414 XR21B1411 XR21B1420/1422/1424 XR22801/802/804 The source code has been tested on various Linux kernels from 3.6.x to 3.17.x. This may also work with newer kernels as well. Installation ------------ * Compile and install the common usb serial driver module # make # insmod ./xr_usb_serial_common.ko * Alternativley install via DKMS # cp -a ../xr_usb_serial_common-1a /usr/src/ # dkms add -m xr_usb_serial_common -v 1a # dkms build -m xr_usb_serial_common -v 1a # dkms install -m xr_usb_serial_common -v 1a * Ensure that thecdc-acm module is not loaded (assumig that it is not needed) # echo blacklist cdc-acm > /etc/modprobe.d/blacklist-cdc-acm.conf # update-initramfs -u * Plug the device into the USB host. You should see up to four devices created, typically /dev/ttyXRUSB[0-3]. Tips for Debugging ------------------ * Check that the USB UART is detected by the system # lsusb * Check that the CDC-ACM driver was not installed for the Exar USB UART # ls /dev/tty* To remove the CDC-ACM driver and install the driver: # rmmod cdc-acm # modprobe -r usbserial # modprobe usbserial # insmod ./xr_usb_serial_common.ko Technical Support ----------------- Send any technical questions/issues to firstname.lastname@example.org.