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DM385 Display Link overflow (on chip HDMI)

hi 

   I am in trouble  when i debug DM358 display link!

   use SDK DVRRDK_04.01.00.02

   on chip HDMI output Black。and the log show as follow

[m3vpss ]  277250: DISPLAY: UNDERFLOW COUNT: HDMI(BP0) 1107, HDDAC(BP0) 1107, DVO2(BP1) 0, SDDAC(SEC1) 1107 

some one can tell me  how to debug this error?

what is display underflow mean? How could it happen?

thank you very much!

Looking forward to your reply!