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ARM: Can´t get rid of error 65: access violation at 0x40025400 : no 'write' permission

*** error 65: access violation at 0x40025400 : no 'write' permission

Hi there! I´m really new to ARM / Keil enviroment so please be nice and bear with me. I´m trying to debug some code (examples) in Stellaris lM4f120 (launch pad) and I´m getting the error above. That happens whenever I try to access Periferal I/O registers or any other address above 0x4000.0000 in simulator mode, the only way out is to edit DEBUG->MEMORY MAP and add, for instance, the range 0x40000000, 0x400FFFFF. The problem is I lost this modification any time I recompile the code. My doubt is: Is there a better way to fix this? a file to edit, a option to check other than editing the Memory Map each time I need to debug the code?? (I guess I´m doing it totally wrong)

As it may be obvious English is not my mother tongue, so my excuses in advance.

Simao