[OE-core] [PATCH v9] kernel-devicetree.bbclass: Add support to generate append to kernel

[Tom Rini]

On Thu, Sep 21, 2017 at 11:48:39AM -0300, Otavio Salvador wrote:
> On Thu, Sep 21, 2017 at 11:37 AM, Tom Rini <trini at konsulko.com> wrote:
> > On Thu, Sep 21, 2017 at 10:58:33AM -0300, Otavio Salvador wrote:
> >
> >> The are use cases where the Device Tree appended to the kernel is
> >> convinient, so we generate the bundle concatenating the kernel (and
> >> potentionally the initramfs) and the Device Tree binaries.
> >>
> >> To enable it, set KERNEL_DEVICETREE_BUNDLE variable to '1'
> >>
> >> Signed-off-by: Otavio Salvador <otavio at ossystems.com.br>
> > [snip]
> >> diff --git a/meta/classes/kernel-devicetree.bbclass b/meta/classes/kernel-devicetree.bbclass
> >> index 72814ca224..6e08be4b70 100644
> >> --- a/meta/classes/kernel-devicetree.bbclass
> >> +++ b/meta/classes/kernel-devicetree.bbclass
> >> @@ -1,6 +1,13 @@
> >>  # Support for device tree generation
> >> -PACKAGES_append = " kernel-devicetree"
> >> +PACKAGES_append = " \
> >> +    kernel-devicetree \
> >> +    ${@['kernel-image-zimage-bundle', ''][d.getVar('KERNEL_DEVICETREE_BUNDLE') != '1']} \
> >> +"
> >>  FILES_kernel-devicetree = "/${KERNEL_IMAGEDEST}/*.dtb /${KERNEL_IMAGEDEST}/*.dtbo"
> >> +FILES_kernel-image-zimage-bundle = "/${KERNEL_IMAGEDEST}/zImage-*.dtb.bin"
> >
> > Frankly, the most common use case today for still needing to concat the
> > dtb to the zImage is for very legacy U-Boot where 'bootz' doesn't exist,
> > so we need uImage (which is in turn why we need to patch the kernel
> > build process, or manually run mkimage, it must be (zImage + dtb) +
> > uImage-header).
> 
> There is also the use case of a single binary to boot. We use it in a
> customer project and we found it quite useful.

That's what FIT is for.

-- 
Tom
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