CCS/IWR6843ISK: Optimization for memory size

Hello Kazuki-san,   

It's not clear from your description what you are trying to do and what issue do you see but it appears that you added some code to the DSP part of the mmw demo and are running into memory section allocation issues.

You should be able to see the section allocation error messages thrown by the linker on the CCS conole (if using CCS project) or on the Command window (if using makefile to build the project) and it shows the amount of memory that couldn't be allocated in the sections defined in the linker command file. Please look at those to get an idea of the overflow first before thinking about size vs speed optimizations options. Typically, size vs speed optimization trade-off option (-ms<X> option) may not work for very large section allocation errors. Secondly, compiling for size reduction results in increased execution time and the program may fail real-time deadlines.

There could be more than one ways to free up space in L2SRAM and this requires an understanding of the Linker command files. One of them involves moving one-time execute code to L3SRAM (slower memory) using overlays.

1. Please refer to the following resources to understand the linker command files and their usage. Please make sure that you understand these concepts first.

1. Linker command file:TI Linker Command File Primer
2. Linker command file (advanced):Advanced Linker Techniques for Convenient and Efficient Memory Usage

2. An example of allocating code in L3SRAM is available in the Overhead People Counting Demo in Industrial Toolbox . Refer to the DSS linker command file for this demo.

Regards

-Nitin