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dm368配置fb后 LCD以及模拟输出黑屏

dm368采用ipnc架构。内核开启Support for frame buffer devices后,产生fb0~3 4个设备文件,但是模拟输出以及LCD画面黑屏,网络输出encode画面正常。请问需要如何配置才能保证LCD输出正常?由于需要添加Qt在OSD图层,才开启framebuffer。谢谢!