Hello Florida Martinez,
First please open console panel from Windows->Show view->Console, and execute the flash programming task again, then capture and attach the flash programming log.
Please check whether it is DDR initialization problem, please follow new project wizards to create a bare board project, then download and execute the sample program from Run->Debug Configurations-><project>-core00_RAM_<processor>_Download->Debug.
In addition, what NOR Flash do you use on your customized target? Have modified Local Bus Interface parameters(BR and OR) in the initialization file according to your target board?
Have a great day,
Yiping
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