Hi, > but there is no imx6ull-14x14-evk.dts
it is located in arch/arm/boot/dts/imx6ull-14x14-evk.dts and it is compiled (among others dts) while building virtual/kernel task. Setting KERNEL_DEVICETREE = "imx6ull-14x14-evk.dtb" simply tells to bitbake to put a copy of imx6ull-14x14-evk.dtb inside your image deploy directory. You can dig through meta/classes/kernel-devicetree.bbclass to see how KERNEL_DEVICETREE is used. If you do not need to modify the dts, you will find all the image related stuff in poky/build/tmp/deploy/images/<MACHINE>/<IMAGE>. If you need to patch the dts (or any other kernel related file): - Clone you kernel source tree locally - Checkout the correct branch - Do your edits, then commit - Get a patch with the customization through git format-patch (or any other way) Now, in your meta layer: - create recipes-kernel/linux/<your-kernel-provider>.bbappend file - create recipes-kernel/linux/files/<MACHINE>/ directory Then: - Copy your patch in recipes-kernel/linux/files/<MACHINE> - Edit the bbappend file with: FILESEXTRAPATHS_prepend := "${THISDIR}/files:" # Add files to the search paths SRC_URI_append_<MACHINE> = " file://0001-your-commit-message.patch" bitbake will apply the patch after the kernel unpack automatically, then build the tree with the patch(es) applied. You can also add a completely new dts via patch, then add it to KERNEL_DEVICETREE. Best regards, Gabriele Il giorno lun 6 mag 2019 alle ore 09:36 JH <jupiter....@gmail.com> ha scritto: > Thanks Gabriele, > > Yes, I have already added KERNEL_DEVICETREE = "imx6ull-14x14-evk.dtb" > to generate an image running on imx6 EVK. What I don't understand is > how that imx6ull-14x14-evk.dtb was compiled? I thought all dtb are > compiled from dts files, but there is no imx6ull-14x14-evk.dts, the > imx6ullevk.conf defined the EVK but there is no detail in that file. > > My second question is my new hardware based on imx6ull MCU now has a > dts file, since I could not see any samples how is the dtb compiled > from a dts file, I have no idea where to put the dts file, how to link > that dts file to generate a dtb file in recipe. Appreciate more > clarification. > > Thank you. > > - jh > > On 5/6/19, Gabriele Zampieri <gabbla.mal...@gmail.com> wrote: > > Hi, > > > > The easiest way is to add them via patches. You can write a recipe that > > patch the Linux tree and put it in your meta layer (usually in > > meta-xxx/recipes-kernel/linux). Then you need to tell Yocto to export the > > dtb via KERNEL_DEVICETREE variable ( > > > https://www.yoctoproject.org/docs/latest/mega-manual/mega-manual.html#var-KERNEL_DEVICETREE > ). > > I usually put this variable in my machine configuration. > > > > Gabriele > > > > Il giorno dom 5 mag 2019 alle ore 14:04 JH <jupiter....@gmail.com> ha > > scritto: > > > >> Hi, > >> > >> I think the device tree blob is build from device tree source, but I > >> could not find any dts files in recipe source directory, there are > >> many dts files in build directory and there are dtb in build > >> directory. > >> > >> If I have a device tree source, where I should put it and how to > >> define the recipe to built it? > >> > >> Thank you. > >> > >> Kind regards, > >> > >> - jupiter > >> -- > >> _______________________________________________ > >> yocto mailing list > >> yocto@yoctoproject.org > >> https://lists.yoctoproject.org/listinfo/yocto > >> > > >
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