# Step 2 Do kernel_menuconfig
# Before this step, let's check current kernel config by search a file name '.config'
find . -name '.config' -type f
# As you can see, there is no file with this name. Now let's go.
make kernel_menuconfig
# As you can see, after answer "Y" to whether save your settings, your personal customized kernel config
# will be save. Let's check out '.config' again.
find . -name '.config' -type f
# Once your personal settings saved, you have to manually save changes to
# ./sdk_kernel/msm-4.14/arch/arm/configs/sdxprairie-perf_defconfig for RELEASE version kernel setting,
# ./sdk_kernel/msm-4.14/arch/arm/configs/sdxprairie_defconfig for DEBUG version kernel setting.