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CCS/TMS570LS1227: Disabling ECC generation

Part Number: TMS570LS1227

Tool/software: Code Composer Studio

I want to disable the automatic ECC generation when loading an image from CCS7 to a TMS570LS1227, so that I can load errored ECC data to test our ECC error handling.

I've unticked the "Auto ECC Generation" option in the "On-Chip Flash" tab, but the ECC memory is still being updated (I've confirmed it is erased before I start programming) - specifically I'm uploading an image to the address 0x00080000 and checking the ECC data at 0xF0410000.

Please can you tell me if there is anything else I need to do?  Is there some other CCS or processor configuration needed to prevent the generation of ECC data?

Best regards,

Steve