Hi Robert, Thank you for your reply. This works and I got my dtb generated in my build directory!
Best wishes, Sohil On Wed, Jul 7, 2021 at 10:29 PM Robert Calhoun <[email protected]> wrote: > > From: [email protected] <[email protected]> on > behalf of Sohil Shah <[email protected]> > > Sent: Wednesday, June 30, 2021 09:46 > > To: [email protected] <[email protected]> > > Subject: [yocto] Question regarding custom device tree update > > > > (...) > > I want to build the image using my custom dts file where I enable > certain peripherals and disable the ones not required. (A test to update > dtb's in future). > > > > I tried different methods found here > > > https://stackoverflow.com/questions/38917745/quick-rebuild-of-device-tree-only-with-yocto-bitbake > > > > But, I seem to run into some errors when I try to build the image. > > > > Please help and let me know if I missed any required information from my > side. > > > >Thank you and Regards, > > Sohil > > Hi Sohil, > > First make a custom layer for you modifications and add it to > bblayers.conf. Then modify your machine definition of KERNEL_DEVICETREE (in > meta-yourlayer/conf/machine/machinname.conf) to specify multiple device > trees, e.g. > > KERNEL_DEVICETREE = "at91-sama5d27_wlsom1_ek.dtb > at91-sama5d27_wlsom1_ek_custom.dtb" > > Note this should specify the "dtb" (compiled device tree name), not the > "dts" (source.) > > Next, make a .bbappend for your linux recipe that will provide the .dts > source, something like: > > FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:" > > SRC_URI += " \ > file://at91-sama5d27_wlsom1_ek_custom.dts;subdir=git/arch/arm/boot/dts \ > " > > Make a subdirectory with package name (e.g. linux-yocto) and put your dts > in there. The "subdir" directive tells bitbake to drop the dts into the > appropriate directory for the linux build process to find it. The device > tree(s) will be built along with linux and put in the image's /boot > directory. You can select which device tree you want to boot with via > u-boot, or by manipulating the symbolic links in the /boot directory. > > Best wishes, > > Rob Calhoun
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