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需要把 OMAP138-> ARM 侧Linux 的LCD显示从宽频改为竖屏（也就是显示旋转 90 度），
OMAPL138 LCDC本身不支持这种功能，但从应用的角度通过将一辐图像数据做转置后再放到LCD frame buffer可以实现你要的效果。或者说在往frame buffer里填充图像时将行列坐标互换一下。当然要看往哪边转，坐标要做相应的变换。
