Compiling this module requires the Xorg development headers.  The easiest
way to get them is to apt-get  install xorg-dev xutils-dev.  Do this on the
target, then mount the target's SD on your PC.

The PATH_TO_TARGET_ROOTFS variable in the Makefile must then be set to 
point at the mount point.

Run make.

Save the tstouch.so file in /usr/lib/xorg/modules/input

Calibration values are currently hardwired into ts-input.c


Save the xorg.conf in /etc/X11/ (or edit your existing file)

You can specify an integration count in the xorg.conf file, in the
"InputDevice" section for the Touchscreen.  For example:

   Option "IntegrationCount" "3"
   
The range is from 0 to 31.  If 0 (the default), no integration is done.  
Other values will calculate the cursor position based on the arithmetic mean 
of previous values read from the touch-screen controller, providing a smoother 
cursor, albeit with commensurate "sluggishness", especially at the higher 
values of IntegrationCount.