[Buildroot] Forcing a kernel rebuild

Ulf Samuelsson ulf.samuelsson at atmel.com
Wed Jul 9 11:37:08 UTC 2008

Hash: SHA1

Bernhard Fischer skrev:
> On Tue, Jul 08, 2008 at 11:42:37AM -0700, Brian Beattie wrote:
>> I'm doing some kernel module development and need to rebuild the kernel
>> modules.  Now I can do this by setting the environment to use the
>> buildroot cross compiler and running make from within the
>> project_{ARCH}/${BOARD}/linux-2.4.24 directory, but I'd really like to
>> just run make from the buildroot directory and have all the cross
>> compile stuff taken care of.
>> If there is currently a way to force the kernel modules to be rebuilt I
>> have not found it, so I added some targets to target/linux/Makefile.in*
>> so that a "make linux26-touch" will touch .configured in the kernel
>> directory forcing a kernel and kernel modules recompile for the next
>> "make".  I have attached a patch for this and would be interested is
>> discussing this approach.  I'm open to any to get this functionality.
> I think you could simply
> $ rm -f project_*/*/linux*/.modules_installed
> $ make linux26-modules

Or you could ensure that the make modules inside
the linux26.mk has the "-B" switch.
I think this will force the rebuild of the modules,
without forcing the whole kernel to be rebuilt.
Ulf Samuelsson

> Alternatively, i suggest to add a
> index 22bbcb9..fd9844e 100644
> --- a/target/linux/Makefile.in
> +++ b/target/linux/Makefile.in
> @@ -256,6 +256,9 @@ linux26-config: host-sed $(LINUX26_DIR)/.configured
>  linux26-update:
>         cp -dpf $(LINUX26_DIR)/.config $(LINUX26_KCONFIG)
> +linux26-force:
> +       touch $(LINUX26_DIR)/.configured
> +
>  # This has been renamed so we do _NOT_ by default run this on 'make
>  # clean'
>  linux26clean:
>         rm -f $(LINUX26_KERNEL) $(LINUX26_DIR)/.configured
> (which i did now) so you can
> make linux26-force && make linux26
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