FriendlyARM Mini210S - Playing with Android

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User button layout:
The 210 boards has 4 buttons:
Key
Function
K1
Back
K2
Home
K3
Menu and Screen rotation
K4
OK
5.2 Playing with Android
5.2.1 Calibrate Touch Screen
After you burn Android into your board you will see a calibration screen on the very
first system boot. The following screen shows the system uses a one wire precise
touching LCD: /dev/touchscreen-1wire (marked in red).