change display device from monitor to a LCD, SPI driver not ready yet, use GPIO to realize the LCD's initialization for this version
EXPORTS
_ZN5Omap36MsTick17SuppressIdleTicksEi @ 1 NONAME
_ZN5Omap36MsTick22EndIdleTickSuppressionEi @ 2 NONAME
_ZN5Omap36MsTick5StartEv @ 3 NONAME