https://rootcommit.l0g.eu/tags/device-tree/ Recent content in Device-Tree on Rootcommit WIP Hugo en-us Mon, 21 Jul 2025 00:00:00 +0000 https://rootcommit.l0g.eu/2025/u-boot-dt-fixups/ Mon, 21 Jul 2025 00:00:00 +0000 https://rootcommit.l0g.eu/2025/u-boot-dt-fixups/ <p>If you compare the device tree as loaded by Linux, available in <code>/sys/firmware/fdt</code>, you will see that it differs from the one that you loaded in U-Boot. Taking the time to make the comparison is quite instructive.</p> <p>Let&rsquo;s do this on my <a href="https://developer.toradex.com/hardware/verdin-som-family/modules/verdin-imx8m-mini/">Toradex Verdin iMX8M Mini</a> SoM on the <a href="https://developer.toradex.com/hardware/verdin-som-family/carrier-boards/dahlia-carrier-board">Dahlia carrier board</a>.</p> <h3 id="decompiling-the-dtb">Decompiling the DTB</h3> <p>It&rsquo;s easy to decompile any Device Tree Binary (DTB) file using <code>dtc</code>, the Device Tree Compiler.</p> <ol> <li> <p>Copy <code>/sys/firmware/fdt</code> from your live Linux system to external storage (assuming your external storage is mounted on <code>/mnt/usb</code>)<br> <code>cp /sys/firmware/fdt /mnt/usb/linux.dtb</code></p>