Hii All,
i am a member of dm355 software developer team in my company. we have a
problem with the noise appearing when we starting a software on dm355.
we are using paralel lcd interface (but the problem is same for SVIDEO
and COMPOSITE outputs with analog lcds) and when our software doing a
lot of memory copy and move the screen is getting very noisy. I have
tested this by different king of software and gui and math libraries.
All time during the first startup of software and the memory activity
is getting higher the noise is reaching the top level. All time when ddr
ram activity is high (linux memory copy and move actions) the noise
coming high. Otherwise noise is still standing on the screen but
sometimes it becomes intolerable.
How can we solve this problem ??? Is there anybody have this problem
too?? The noise is appearing as some block of pixels beginning to
zigzag horizontally and some thin group of pixel lines are sliding on
screen horizontally again. After the succesfull starting of the software
the noise is getting very very lower. But when another high memory
activity happens the noise is getting higher again.
My kernel is default montavista linux kernel 4.0 i have done the
software updates but the problem is still exists.
Thank you very much for help ad reading. I need all advices and ideas to
consider on.
Serkan Erdogan
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