CrossToolchain
The Cross Toolchain for the ICnova devices is included within the buildroot. It's being created the first time the image is generated. It contains all the programs needed to create software for the ICnova.
After generation, the toolchain can be found in the directory build_arm/staging_dir/usr/bin. You can use it to create your own programs, too. If you move the compilation of your program to project_build_arm/
See also Buildroot directories