while reading CTRLSTAT i got 0xffffffff

sir, i am working on ARM CORTEX M4 architecture over serial wire debug protocol,i got IDCODE(2ba01477) as per arm technical reference manual,when i am writing 0x50000000 into CTRLSTAT register i got...
while reading CTRLSTAT i got 0xffffffff

sir, i am working on ARM CORTEX M4 architecture over serial wire debug protocol,i got IDCODE(2ba01477) as per arm technical reference manual,when i am writing 0x50000000 into CTRLSTAT register i got...
const unsigned int iPage0CS[2] __at(0x07F8) = {0xFFFFFFFF,0x16400000};

I'm new to Cortex M3 core. From a demo project code I see this assignment but I don't know what is the purpose of this. Does anyone have a clue? Thanks.
const unsigned int iPage0CS[2] __at(0x07F8) = {0xFFFFFFFF,0x16400000};

I'm new to Cortex M3 core. From a demo project code I see this assignment but I don't know what is the purpose of this. Does anyone have a clue? Thanks.
ERROR(COR97): Range AHB_M_0:0x00000000..AHB_M_0:0xFFFFFFFF overlaps with range currently in map.

I have a target I am connecting to. I can connect successfully in the GUI, but I am trying to use the command line debugger.exe to automate some of my flow. I am getting the error in the title: ERROR...