title: Compile FTDI kernel module
body: <p>I'm trying to add the usb to serial port driver to my arch linux arm device, and I noticed that the kernel source tree already includes the source files for the FTDI driver, located in:</p>
  
  <p>drivers/usb/serial, there exists the ftdi_sio.c and ftdi_sio.h files.</p>
  
  <p>When I navigate to kernel/drivers, I cannot find the ftdi_sio.ko module anywhere.</p>
  
  <p>How do I build the ftdi kernel module and include it to boot so I can have usb to serial port capability on my arch linux arm?</p>