I have done make menuconfig for a board defconfig and modified few configurations. When I select save, a new .config was created in the Kernel top directory.
I want to create new defconfig for this .config file created.
Can I copy the .config as a new defconfig and copy to arch/arm/configs/?
$ cp .config arch/arm/configs/board_new_defconfig
I think you have to do just one command and use the created file as you want to.
% make savedefconfig
% cp defconfig arch/arm/configs/my_cool_defconfig
To get all possible targets just run
% make help
As noted by Adam Miller followed by Jeremy, users of Buildroot distribution can use wrappers for that purpose, i.e. (per Buildroot manual, section 8.1):
- linux-savedefconfig for
linux - barebox-savedefconfig for
bareboxbootloader - uboot-savedefconfig for
U-Bootbootloader
make savedefconfig minimizes the generated defconfig skipping redundant configs that are implied by others.
For your platform, in a new defconfig file, yes. In fact this is the safest way to create a new defconfig. If you manually remove config entries from an existing config file to create a new one, you are likely to get dependency issues and during build, it might restart the kernel config and give you prompts for selecting individual config options.
来源：https://stackoverflow.com/questions/27899104/how-to-create-a-defconfig-file-from-a-config