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I'd look at the program sections in the elf file and see if the numbers match. It might be that the imiage is trying to cover a massive gap in the address space.
IIRC the EPCS boot code can only load to a contiguous address block (this really should be fixed by Altera) so usually all the initialised data is linked to physical addresses that follow the code - and the first code the nios runs copies it into the required places.
This just doesn't work unless you are loading into SDRAM (assumed to be big).
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I will look up the elf file tommorow. The second thning shuld not be a problem because I am loading my application code into a 128 kByte SDRAM.
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