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Compiler/PROCESSOR-SDK-AM65X: Devmem DDR access fails

Part Number: PROCESSOR-SDK-AM65X


Tool/software: TI C/C++ Compiler

 SDK version :06.01.00.08

I am getting following error while accessing DDR ,

devmem2 0x80000000
/dev/mem opened.
Error at line 90, file devmem2.c (1) [Operation not permitted]

what changes are needed in kernel ,any leads appreciated