Touchscreen Calibration (DIVELK)
If the Weston compositor is running in the background, it is necessary to remove the old udev rules, and restart the device in order to calibrate the touchscreen.
rm -f /etc/udev/rules.d/ws-calibrate.rules reboot
At the next restart the weston-calibrator tool should automatically show up. Tap on the red cross appearing on the screen to calibrate the touch panel.
Note: In the case of root filesystem over NFS and SD card plugged in, make sure delete also the calibration rules stored in the SD card partition before rebooting:
rm /etc/udev/rules.d/ws-calibrate.rules rm /run/media/mmcblk0p1/ws-calibrate.rules reboot
Non-Weston based Graphic System
If the weston compositor is not running, it is necessary to run:
export TSLIB_CALIBFILE=/usr/share/pointercal ts_calibrate
The environment variable TSLIB_CALIBFILE is used by the tslib package to indicate the location of the pointercal file. The default value for TSLIB_CALIBFILE is /etc/pointercal. If you are writing a program that uses tslib you should make sure that you export TSLIB_CALIBFILE to point to the location of your pointercal file (as indicated in the previous section), or that you place a copy of the pointercal file at the default /etc/pointercal location.
Additional information can be found int the following page in TI wiki