http://processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen#Weston_based_Graphic_System
rm /etc/udev/rules.d/ws-calibrate.rules rm /run/media/mmcblk0p1/ws-calibrate.rules reboot
http://processors.wiki.ti.com/index.php/How_to_Recalibrate_the_Touchscreen#Weston_based_Graphic_System
rm /etc/udev/rules.d/ws-calibrate.rules rm /run/media/mmcblk0p1/ws-calibrate.rules reboot