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Why RAM overflow?

Question asked by Jianfeng Zheng on Aug 29, 2016
Latest reply on Aug 30, 2016 by Alice_Yang
I use MK22FX512VLQ,also implement ProcessorExpert
when adreess of RAM exceed to 0x1FFFFFFF,Link fails,  the Console output says m_data overflowed, as following
But I know the RAM space end-address is 0x20007FFF,Why is the space m_data_20000000 not available? 
Please tell me how to set Build Options of PE or others.  Thank you!
Further more, I modified the _estack to x20008000 in ProcessorExpert.ld, but it is no use。below is the cut of screen.