Be carefull: current kernel's .config will be lost!
Usage: diffdefconfig [-d DEFCONFIG] [SOURCE] TARGET
Current directory must be in root of kernel.
If no SOURCE specified then source will be a .config made from
defconfig set by the -d option (default = mvebu_v7_defconfig).
Example: 'diffdefconfig myconfig.config', result in diff_defconfig
You can use the diff_defconfig file as follows:
cp arch/arm/configs/mvebu_v7_defconfig arch/arm/configs/merged_defconfig
cat diffdef/diff_defconfig >>arch/arm/configs/merged_defconfig
make ARCH=arm merged_defconfig
The resulting .config will be the same as the original myconfig.config.
Example: 'diffdefconfig myconfig1.config myconfig2.config'
Compares .config files, list changes except kconfig's defaults.