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CCS/TM4C1294NCPDT: Not able to execute Complete Flash Erase

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: TM4C1294KCPDT,

Tool/software: Code Composer Studio

Hi,

I have a project which was meant for a custom board with TM4C1294KCPDT with 512 KB Flash. Later we ended up changing it to TM4C1294NCPDT which has 1MB Flash. 

When I'm flashing the code I can see in memory browser that only 512KB is getting erased. I have changed my Flash range in .cmd file to FLASH (RX) : origin = APP_BASE, length = 0x00100000 and I can also see that in my debug settings erase entire flash is selected. Also, I have selected TM4C1294NCPDT in my general settings for the project. 

Is there something else that I need to change? I want the entire flash to be erased because I'm storing data only if the location is 0xFF.

Thank you.

-Deepak