About android resistive touch screen calibration questions

I look after some of S5PV210/6410 resistance screen development board in Brush first start will pop up a calibration touch screen software, we ordered five points will enter the system in this way is usually calibrated in android write a java program then generate seven parameters stored on a file
Every time you start to read it on several parameters on it.
But I found some very strange S5pv210 development board, touch screen calibration software will not pop up brush machine, only the first time you start slowly, still able to enter the system touch screen, the effect is still quack. How is it that this does not require calibration it?
wince under resistive screen also needs to be calibrated. So I think that's incredible, and the most incredible is that this S5pv210 development board 4.3-inch and 7-inch resistive screen is not calibrated, both just modify the display driver, can be used normally.
I guess the following relationship
An automatic calibration? But I did not go to the point, where's the point of data? Strange
2. Wrote that a few dead seven parameters? Unlikely ah, because seven inches and 4.3 inches parameters like ah impossible? o? , My god!

Please give pointers about, which in the end is how reason, the screen is not calibrated resistance can be used very weird.

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Reply:
Friendly tiny6410/tiny210 brush machine needs to be calibrated.

And my line down an android package actually do, how could not find the reason. Depressed dead.
Reply:
Khan, how no one to help ah. Weighs.
Reply:
Landlord, here to ask you questions, you say directly write java program, you need to calibrate the touch screen to get the physical coordinates, through the algorithm to calculate the calibration parameters, but you in your application how you get?
Reply:

reference to the third floor of the reply:

landlord, ask your questions here, you say directly write a java program, you need to calibrate the touch screen to get the physical coordinates, calculated by the algorithm the calibration parameters, but you in your application how you get?

To read touch screen driver ah.
But I do not want to use this way, the strange thing is, I bought a development board, there is no need to start the calibration, the magic of.
Reply:
A long time, no one gave a hint?
Reply:
Did not answer, look after it.
Reply:
Because they died in the kernel to write. Has been calibrated, you change the resolution of a screen is not to die.