Cmd file

1. What the .cmd file does

A .cmd file in CCS is a linker command file, which tells the TI ARM linker (armcl) how to map sections of your code and data to memory:

Where the interrupt vector table goes (.intvecs → usually FLASH start).

Where the .text (code), .data (initialized RAM data), .bss (zeroed RAM data), .stack, and other sections go.

Defines heap/stack sizes, memory origin addresses, and load/run locations (e.g., .TI.ramfunc).

Without it:

The linker doesn’t know where to put code and data in the microcontroller memory.

Your program may not run, or vectors may be in the wrong place, causing crashes.

So it is essential for the final build. 2. Can you rename it?

Yes, you can rename a .cmd file, but with conditions:

You must tell CCS or the build system the new name:

    In CCS:

        Right-click the project → Properties → Build → ARM Linker → File Search Path → Command File

        Set the new .cmd filename.

    Or in a Makefile: replace the old .cmd reference with the new one.

Make sure the file still contains correct memory sections for your MCU.

The .cmd file extension must remain .cmd; just the name can change.

Renaming won’t break the linker as long as CCS knows the new file name. ✅ Summary

The .cmd file is critical for correct memory layout and linking.

You can rename it, but update the CCS project settings to point to the new name.

If you don’t use a .cmd file, you’d have to supply all memory layout information directly in the project settings, which is usually less convenient.