Re: [yocto] System device tree, AMD EDF, custom board

On Wed, Jan 28, 2026 at 4:59 PM pierre.daye via lists.yoctoproject.org
<[email protected]> wrote:

>
> Dear All,
>
> I am currently updating my workflow to move to Scarthgap.
> The issue I am facing is related to the fact that I use a system device
> tree generated by sdtgen from my XSA design than I use genmachine-conf to
> create the configuration files and set my machine name.
> Now is the pickle for me. I don't know how to add a device tree
> specification that is related to my custom board (and not to the FPGA and
> the design itself, e.g. a device connected to an i2c bus defined in the PL).
> If I add it as I was doing it before, it doesn't find the labels that are
> defined in the PL part of my design and only focuses on the one accessible
> by the PS part.
>
> Any help, pointers, would be greatly appreciated !
>
> Thanks,
>
> Pi-r
>
>
Hello, Pierre

Here is my proposal (maybe there is a better way :) )

I've created custom layer let's call it meta-my-custom-board with
"bitbake-layers create-layer -a ..." and put device-tree.bbappend here

meta-my-custom-board
├── conf
│   └── layer.conf
├── COPYING.MIT
├── README
└── recipes-bsp
    └── device-tree
        ├── device-tree.bbappend
        └── files
            ├── custom_device.dtsi <----------- here just list of /include/
"... below dtsi ..."
            ├── one.dtsi
            ├── two.dtsi
            └── three.dtsi

In custom bbappend I've customized do_configure to append main dtsi to
linux dts

FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
SYSTEM_USER_DTSI ?= "custom_device.dtsi"
SRC_URI:append = " file://${SYSTEM_USER_DTSI}"
SRC_URI:append = " file://one.dtsi"
SRC_URI:append = " file://two.dtsi"

TARGET_DTS_MODIFY ?= "cortexa53-linux.dts"

do_configure:append() {
    set -xe
    echo "Running do_configure for ${MACHINE}..."
    if [ -f ${S}/${TARGET_DTS_MODIFY} ]; then
       if ! grep -q "/include/ \"${SYSTEM_USER_DTSI}\""
"${S}/${TARGET_DTS_MODIFY}"; then
          echo "/include/ \"${SYSTEM_USER_DTSI}\"" >>
${S}/${TARGET_DTS_MODIFY}
       fi
    fi
}

HTH,

-- 
Best Regards,
Sergei Nikulov