ARM development studio cortex-a55 FVP is writing a pattern of 0xdfdfcf .How to overcome this?

Hi Bhargavi

As Jason wrote, the 0xDFDFDFCF pattern you see is the reset/default value of modeled memory, so it seems nothing been written there yet.

As a first check, please try importing an running the ready-made "fireworks_Cortex-A55_Cortex-A76" example.
File > Import > Arm Development Studio > Examples and Programming Libraries, then enter e.g. “fireworks” in the search filter.  Does that example run OK?

The next step is to investigate why your own example isn't running, but to help us, you'll need to provide more information about it, for example:
1) Was startup64.axf made by you, or is it an example from elsewhere?
2) Which compiler, exactly, was used to build startup64.axf?
3) At what address is startup64.axf loaded?  Do you see the code initially correctly in the Disassembly view?  Are you able to single-step the first few instructions correctly, or even to run to main() (if there is one)?
4) For the memory where you see the 0xDFDFDFCF pattern, what do you expect to see loaded there, e.g. code, rw-data (.data), or zi-data (.bss)?  We have seen cases before of GCC-generated apps not having their RW/ZI data initialised correctly.
5) Is the Cortex-A55 FVP model being launched with the correct parameters, e.g., with "-C bp.secure_memory=false -C pctl.startup=0.0.*.*" ?

Hope this helps,

Stephen

Hi Bhargavi

As Jason wrote, the 0xDFDFDFCF pattern you see is the reset/default value of modeled memory, so it seems nothing been written there yet.

As a first check, please try importing an running the ready-made "fireworks_Cortex-A55_Cortex-A76" example.
File > Import > Arm Development Studio > Examples and Programming Libraries, then enter e.g. “fireworks” in the search filter.  Does that example run OK?

The next step is to investigate why your own example isn't running, but to help us, you'll need to provide more information about it, for example:
1) Was startup64.axf made by you, or is it an example from elsewhere?
2) Which compiler, exactly, was used to build startup64.axf?
3) At what address is startup64.axf loaded?  Do you see the code initially correctly in the Disassembly view?  Are you able to single-step the first few instructions correctly, or even to run to main() (if there is one)?
4) For the memory where you see the 0xDFDFDFCF pattern, what do you expect to see loaded there, e.g. code, rw-data (.data), or zi-data (.bss)?  We have seen cases before of GCC-generated apps not having their RW/ZI data initialised correctly.
5) Is the Cortex-A55 FVP model being launched with the correct parameters, e.g., with "-C bp.secure_memory=false -C pctl.startup=0.0.*.*" ?

Hope this helps,

Stephen