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AM3358: Touchscreen issue

Part Number: AM3358

hello we have developed an am3358 based custom board with ref design of starter kit

in starter kit there is 4.3 inch touch screen available on board

in our board we are using 7 inch innolux lcd

after successful board boot i am unable to click on matrix launcher icon using touch

which file or code should i look for further modification to solve touch screen issue...?