Hi,
The following concepts applicable to only C66x devices (multicore DSP) and not C674x.
We are referring this only for analyzing the problem of EMC_BUSERR.
EMC_BUSERR meant by CFG bus error event.
The CFG bus error event (EMC_BUSERR) and the CFG bus error register (ECFGERR) signals error for transactions on the external configuration bus.
The EMC (external memory controller) controller monitors transaction errors that occur in the Configuration Bus when accessing global configuration space from the DSP core. Bus errors trigger an event that is routed to DSP Core interrupt controller input event 127.
and also as you said that the difference between working and non-working application is the location of the application get stored (ie external SDRAM and internal SDRAM)
So can you please check your SDRAM configurations and initialization sequence in your code.
You can also view the status of the register ECFGERR & ECFGERRCLR to check the what type of transactions error occurred.
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What is a transaction ID and what is significant about 'E'?
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http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sprugw0&fileType=pdf