[Buildroot] [PATCH] Linux kernel: add support for config fragment files

Baruch Siach baruch at tkos.co.il
Tue Feb 10 21:16:51 UTC 2015


Hi Floris,

On Tue, Feb 10, 2015 at 10:09:44PM +0100, Floris Bos wrote:
> On 02/10/2015 08:19 PM, Baruch Siach wrote:
> >On Tue, Feb 10, 2015 at 02:50:21PM +0100, Floris Bos wrote:
> >>Adds configuration option to merge additional kernel configuration files
> >>to the main kernel configuration using scripts/kconfig/merge_config.sh
> >>
> >>For use-cases in which it is desired to build a custom Linux kernel based on
> >>the defconfig of the target device, but with a couple extra options/modules
> >>enabled.
> >>
> >>Signed-off-by: Floris Bos <bos at je-eigen-domein.nl>
> >>---
> >[...]
> >
> >>@@ -178,6 +179,8 @@ define LINUX_CONFIGURE_CMDS
> >>  	$(INSTALL) -m 0644 $(KERNEL_SOURCE_CONFIG) $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
> >>  	$(TARGET_MAKE_ENV) $(MAKE1) $(LINUX_MAKE_FLAGS) -C $(@D) buildroot_defconfig
> >>  	rm $(KERNEL_ARCH_PATH)/configs/buildroot_defconfig
> >>+	$(if $(LINUX_KERNEL_CONFIG_FRAGMENTS),
> >>+		$(@D)/scripts/kconfig/merge_config.sh -m -O $(@D) $(@D)/.config $(LINUX_KERNEL_CONFIG_FRAGMENTS))
> >The merge_config.sh script is in the kernel since version 3.3. The -O
> >parameter is only supported since v3.9. How do you handle older kernels?
> 
> Could make it use the merge_config.sh we have in buildroot (in
> support/kconfig) instead, if support for old kernel versions is a
> requirement.

Sounds better, IMO. You may also consider going one further step, and add this 
feature to the generic kconfig infrastructure.

baruch

-- 
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