[OpenWrt-Devel] [PATCH 2/3] build: use options to add kernels/dtbs in rootfs

Luka Perkov luka at openwrt.org
Tue Aug 12 07:48:36 EDT 2014

On Tue, Aug 12, 2014 at 01:12:50PM +0200, Jonas Gorski wrote:
> On Mon, Aug 11, 2014 at 10:48 PM, Luka Perkov <luka at openwrt.org> wrote:
> > On Mon, Aug 11, 2014 at 10:06:27PM +0200, Felix Fietkau wrote:
> >> On 2014-08-11 10:47, Luka Perkov wrote:
> >> > Use support for options to enable targets and profiles select kernel or dtb
> >> > inclusion by default.
> >> >
> >> > Signed-off-by: Luka Perkov <luka at openwrt.org>
> >> What's the rationale for having this stuff as config options in the
> >> first place? It seems to me that it makes a lot more sense to control
> >> this from the target's image/Makefile.
> >
> > Here are the reasons:
> >
> > * Simplified image/Makefile for targets, no extra ifdefs
> .. which makes it impossible to build images for both a device needing
> it and a device not needing it at the same time.
... but that is how build system works now. This patch series is not a
stopper for the the fix of the problem you are pointing out here. If you
have better way to deal with this feel free to send a patch. And don't
forget to take in account third point below.

> > * Users can select if they want to include kernel/dtb or not - it is not
> > hardcoded in the image/Makefile. For example, if one is building ramdisk
> > image only no need to include kernel in rootfs.
> As a user, I would not want to have to make that decision. Either the
> device needs the kernel in the rootfs, then it should be automatically
> included, or it does not, then it shoudn't be there. If it isn't
> needed for initramfs kernels, then selection state shouldn't have any
> effect on the ramdisk contents.

Then as a user don't touch default settings ;)

> > * Introduces ground work for including other options which can not be
> > built as modules. Such as lxc/kexec support by default.
> As I said on 1/3, lxc/kexec is a bad example. An IB built with profile
> A selected and an IB built with profile B selected should be able to
> create identical* images, regardless of which profile was selected
> while building the IB.

As explained in the other email lxc/kexec would be set at target level
and not on the profile level. That said, the point you are making does
not make any sense to me.

> Jonas
> * apart from time stamps

And user who run the build and machine it was built on. If we get picky
we could probably find couple of other things.

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