Breakpoints do not work with CortexM4 Fast Model

Hello Stephen,

first, many thanks for your answer, it's crystal-clear.

Unfortunately, we still cannot put breakpoints in C source code running on M4.

It works when going on the disassembled window. So breakpoints on assembly code = OK. But not on C code even if we used add symbol file command with the proper path to the ELF binary file.

In the "debug configurations" window, we did this:

- in "files", set the field "application on host to Download" with the path of the binary , using ${workspace_loc} (since the embedded code has been imported into ARM DS)

"Load symbols from file" has been set up with the same file path.

In "debugger", we provided the field "execute debugger commands" with add-symbol-file with the same file path than previously.

I have no problem with this configuration on R52 Fast Model 11.16, but it does not work with cortex M4 Fast Model 11.15 ....

So we are unable to debug the M4 software easily (with the C code instead of assembly) 

Best Regards

Frederic Huguet

Hello Stephen,

first, many thanks for your answer, it's crystal-clear.

Unfortunately, we still cannot put breakpoints in C source code running on M4.

It works when going on the disassembled window. So breakpoints on assembly code = OK. But not on C code even if we used add symbol file command with the proper path to the ELF binary file.

In the "debug configurations" window, we did this:

- in "files", set the field "application on host to Download" with the path of the binary , using ${workspace_loc} (since the embedded code has been imported into ARM DS)

"Load symbols from file" has been set up with the same file path.

In "debugger", we provided the field "execute debugger commands" with add-symbol-file with the same file path than previously.

I have no problem with this configuration on R52 Fast Model 11.16, but it does not work with cortex M4 Fast Model 11.15 ....

So we are unable to debug the M4 software easily (with the C code instead of assembly) 

Best Regards

Frederic Huguet

Hi Frederic

Sorry that you are still having problems.  Here's some things to try/check:

1) Please try the startup_Cortex-M4_AC6 example provided in Arm DS.  This shows C source-level debug of code running on the Cortex-M4 FVP model.

2) Check that your C code is compiled with "-g", which adds debug information into the image.

3) There's no need to have "Load symbols from file" and "add-symbol-file".  Just having the debug .axf in the "Application on host to download" and the "Load symbols" tick-box next to it ticked should be sufficient.

4) I'm puzzled why you have two different versions of Fast Models FVPs (R52 11.16 and M4 11.15).  Do you have two versions of Arm DS installed?  This won't solve your problem, but I suggest you update to the latest Arm DS 2022.0, which includes FVPs from Fast Models 11.17.

Hope this helps

Stephen