[meta-freescale] dts and dtb files

Niklas Molin niklas.p.molin at gmail.com
Wed Jan 22 23:48:13 PST 2014


I just wanted to check if there is a way to compile the dts files with
I can see that my dtsi -file is updated in the directory where I have my
dtb file.
But the dtb file is not updated when I run bitbake.
So do I have to manually compile the dts file or is there some way to do it
via bitbake?


On Mon, Jan 20, 2014 at 12:15 AM, Mats Kärrman <Mats.Karrman at tritech.se>wrote:

> Hi Niclas,
> (Please keep the list on cc)
> At Friday, January 17, 2014 11:12 PM, Niklas Molin [
> niklas.p.molin at gmail.com] wrote:
> > So in my .conf file (machine config) I have the KERNEL_DEVICETREE, which
> points to some .dtb files.
> > Will these .dtb files be generated by "compiling" the dts/dtsi files?
> > If so, where do setup the path to where these dts/dtsi files are located.
> > Right now when I look in my Sabresd directory I have dts/dtsi files in
> following paths:
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/linux-imx/3.10.9-r0/image/usr/src/kernel/arch/arm/boot/dts/
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/linux-imx/3.10.9-r0/package/usr/src/kernel/arch/arm/boot/dts/
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/linux-imx/3.10.9-r0/packages-split/kernel-dev/usr/src/kernel/arch/arm/boot/dts/
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/linux-imx/3.10.9-r0/git/arch/arm/boot/dts/
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/linux-imx/3.10.9-r0/sysroot-destdir/usr/src/kernel/arch/arm/boot/dts/
> >
> cortexa9hf-vfp-neon-poky-linux-gnueabi/linux-libc-headers/3.10-r0/linux-3.10/arch/arm/boot/dts/
> > From which directory is it "compiling" the dts/dtsi files?
> The .dtb is built as part of the Linux kernel build, not the
> linux-libc-headers. On my machine I find the .dts source files at:
> ./build/tmp/work/${MACHINE}-poky-linux-gnueabi/linux-imx/3.10.9-r0/git/arch/arm/boot/dts
> You need to make a patch for the linux kernel source or otherwise
> copy your .dts file to this directory before do_install.
> The .dtb files listed in your machine conf are compiled from .dts
> files with the same name. The compiler is called "dtc" and is a
> tool built as part of the linux kernel build (see .../git/scripts/dtc).
> You can run the tool with "--help" for more info. A good feature
> is that you can run it backwards, producing a .dts from your .dtb
> so you can make sure you've got all your changes right.
> BR // Mats
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