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请问想实现LCD屏和HDMI屏同时显示，目前使用贵司提供的源码在uboot中drm参数配置有二级显示，但不能实现同时都显示，从驱动力可以看出5728是支持同步显示的
需要协助：我想实现双屏同步显示该如何修改？
