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AM5728: LTP-DDT problem

Part Number: AM5728

I copy the paltform file am57xx-evm to am57xx-myboard and change it ike following:

armv7l
dra7xx
am57xx-myboard

but there is so many errors:

<<<test_start>>>
tag=VIDEO_S_FUNC_GST_MPEG4_480P stime=1562477083
cmdline="source 'common.sh'; do_cmd 'gst.sh -d "M4V/HistoryOfTI-480p.m4v" -c "mpeg4" -r "480p"'"
contacts=""
analysis=exit
<<<test_output>>>
|TRACE LOG|Inside do_cmd:CMD=gst.sh -d "M4V/HistoryOfTI-480p.m4v" -c "mpeg4" -r "480p"|
Demo file /usr/share/ti/video/HistoryOfTI-480p.m4v exists
|TRACE LOG|Inside do_cmd:CMD=gst-launch-1.0 playbin uri=file:///usr/share/ti/video/HistoryOfTI-480p.m4v video-sink="kmssink" audio-sink="alsasink"|
Setting pipeline to PAUSED ...
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstAlsaSink:alsasink0: Could not open audio device for playback.
Additional debug info:
../../../gst-plugins-base-1.14.4/ext/alsa/gstalsasink.c(865): gst_alsasink_open (): /GstAlsaSink:alsasink0:
Playback open error on device 'default': No such file or directory
Setting pipeline to NULL ...
Freeing pipeline ...
|ERROR|Line: File:gst-launch-1.0 playbin uri=file:///usr/share/ti/video/HistoryOfTI-480p.m4v video-sink="kmssink" audio-sink="alsasink" failed. Return code is 255 - |
|ERROR|Line: File:gst.sh -d "M4V/HistoryOfTI-480p.m4v" -c "mpeg4" -r "480p" failed. Return code is 255 - |
<<<execution_status>>>
initiation_status="ok"
duration=0 termination_type=exited termination_id=255 corefile=no
cutime=12 cstime=2
<<<test_end>>>

So, what'this? How does the runltp use the platform file to decide the test?