To upgrade the RIO Linux driver please do the following steps:

1. Download the modified RIO source files:
    generic_serial.c
    riocmd.c
2. Copy these files to the appropriate kernel directory
     "/usr/src/linux/drivers/char" for the generic_serial.c file
     "/user/src/linux/drivers/char/rio" for the riocmd.c file
3. Recompile the module source by typing
     /usr/src/linux/make modules 
4. Install the recompiled modules by typing
     /usr/src/linux/make modules_install
5. Reboot the PC