first of all, you should try to get a proper system clock configuration - otherwise all further steps do not make much sense. Try to figure out the differences between your hardware and the STM32F429 Eval board and try to adjust the clock settings.
Then, please ensure that the SDRAM is working properly - this can be done by using the SDRAM memory test.
If you still have some startup problems, please post the log that you receive via serial connection and your makefile / project configuration.
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