please try to get a console working in order to receive error messages from the target. This helps enormously for this and other errors.
Furthermore, let me recommend to execute the SDRAM memory test in order to ensure that (uncompressed) data that is loaded into SDRAM gets not corrupted.
Please put the SDRAM test code snippet before the initialization of the memory manager (the function call EwInitHeap() can be found in ewmain.c).
If you do not have a possibility to connect a USART - do you have a debugger? Then you can monitor the function EwPrint().
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