Hi,
after a long search, I found how to use the display driver without fbtft
https://www.raspberrypi.org/forums/viewtopic.php?t=124961
I used the display 3.5in TFT witch SPI on the OPi PC on Armbian jessie.
lcd on ali:
http://www.aliexpress.com/item/High-end-3-5-LCD-Touch-Screen-Display-Module-Board-320x480-RGB-For-Raspberry-Pi-2/32611946526.html?spm=2114.30010308.3.21.j1gFEx&ws_ab_test=searchweb201556_8,searchweb201602_2_10048_10047_10037_10017_10046_10033_10045_406_10032,searchweb201603_1&btsid=057be304-5a97-4dff-9905-87cf320dcb67
After some refinement
because this interface is very very slow
my modified code is attach
https://github.com/maxk9/3.5-TFT-LCD-KeDei.git
sorry for my bad english