Since RCPL 21 or 22, rebuilding busybox makes kernel to be rebuilt from checking out kernel sources.
1 Configure platform project. ${WRL_HOME}/wrlinux-5/wrlinux/configure \ --enable-build=production \ --enable-board=stm-spear13xx \ --enable-kernel=preempt-rt \ --enable-rootfs=glibc_small \ --enable-ccache=yes \ --with-rcpl-version=0022 \ --with-sstate-dir=~/tmp/make \ --enable-jobs=2 \ --enable-parallel-pkgbuilds=2 2 make fs 3 Add a fs_final*.sh script. touch layers/local/conf/image_final/fs_final_test.sh chmod a+x layers/local/conf/image_final/fs_final_test.sh 4 Rebuid busybox. make -C build busybox.rebuild 5 make fs You will see kernel build from checking out kernel source.