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ADUCM3029 cstack location

I m working with ADUCM3029 under the MODE3 ram configuration . And the Cstack is placed at end of dRAM_always_retained_region by default.I want to move it to the end of dRAM_bank2_retained_region. When i did so, i can build the project, but when i start debug, the memory from 0x20003fff become unreadable ,like the picture below, and the program went into Hardfault_handler.

but when i put the Cstack at end of  dRAM_bank1_retained_region, it bcomes normal, and the program works fine:

Does the cstack cant place at the end of dRAM_bank2_retained_region?