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f28335 Memory map tool and RAM

I implementing MODBUS at F28335 DSP but I need 256k of space (the addresses from 0x00000 to 0x50000) to full implement it. At memory map tool I see there is a space called RAM which goes from 0x100000 to 0x2FFFFF. The problem is: I can´ modify it. This memory is locked or something like that? And, if it is, I can only use the RAM to implement the MODBUS?