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DM6446 OSD自动消失

您好!

我的硬件平台:DM6446

启动参数配置:

setenv bootargs video=dm64xxfb:osd0=720x576x16,2025K@0,0 output=pal

在显示器上能显示我的字符,

问题:

       显示的字符大概9分钟后自动消失了,更新字符的程序有执行,但是为什么不显示字符了?