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This resolution (QVGA in portrait orientation) is not supported by default in the ti81xx linux kernel. May be this is the root case. Can you try with some of the officially supported display resolutions, will you have the same issue?
Check linux-kernel/drivers/video/ti81xx/vpss/sysfs.h to get name of the supported modes.
This issue been resolved.
Failure in HW which resulted in wrong timing !
for anyone with similiar issue: if the image appear in new line or area each time, it is probably a timing issue.....