Remember to Initialize Submodules

git submodule update --init

To Grab the device defconfig

BR2_EXTERNAL=../simple_sbc make f1c200s_simple_sbc_defconfig

To make modifications to the config run

make menuconfig

To make the actual bin file run

make clean
make

To make on WSL with a slightly wonky path try

PATH=$(grep -v '[[:space:]]'<<<"${PATH//:/$'\n'}"|paste -sd:) make

To save changes to the defconfig

make savedefconfig