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am5728上电启动后，hdmi会开启一个终端：
/sbin/agetty --noclear tty1
现在的问题是，自动启动后，弹出登录界面，之后不停打印
@︿@︿@︿@︿@@︿@︿@︿@︿@︿@︿︿@︿@︿@︿@︿@︿@︿@︿@︿@︿@︿
直到以任意一个用户名登录系统后才停止，请问哪位大师遇到过这种情况？怎么解决？谢谢。
