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How to relocate/execute a function to DDR.

Question asked by TAN DINH on Dec 27, 2018
Latest reply on Jan 14, 2019 by TAN DINH

I based on the link:… and was able to relocate a function to the external DDR (0xa000_0000). I verified the relocated function was copied to the DDR and was able to single step to the function. However, as soon as I stepped to the first instruction "a4000000: push {r7, lr}", it led to the HardFault handler. Please help and let me know what am I missing. 

I include the KDS example project in the attachment.