The device tree is a data structure that describes the hardware components available on a system. The Linux kernel queries the device tree to know what drivers to load during boot.
Device tree file types
Device tree files are located at
arch/arm/boot/dts/ and can have two extensions:
.dtsifiles are device tree source include files. They describe hardware that is common to several platforms which include these files on their
.dtsfiles are device tree source files. They describe one specific platform.
ConnectCore 6 Plus system-on-module
The ConnectCore 6 Plus is a system-on-module (SOM) solution that integrates:
NXP i.MX6QP system-on-chip featuring many interfaces such as UART, CAN, SPI, and I2C
Optional Wi-Fi + Bluetooth chip
Optional Kinetis chip
The ConnectCore 6 Plus system-on-module needs to be soldered to a carrier board.
For this reason, there is not a single
.dts file for it.
Instead, its hardware features are collected into
.dtsi files that can be included by a final platform
Since the ConnectCore 6 Plus system-on-module is offered in different variants, multiple
.dtsi files have been defined to describe the hardware inside:
Common hardware for ConnectCore 6 Plus system-on-module variants with QuadPlus/DualPlus CPU
ConnectCore 6 Plus system-on-module variant with QuadPlus/DualPlus CPU, Wi-Fi, and Bluetooth
ConnectCore 6 Plus SBC
The ConnectCore 6 Plus SBC is a carrier board assembling the ConnectCore 6 Plus system-on-module. The carrier board assembles additional hardware like a video port, Ethernet PHY, audio chip, PCIe minicard, microSD card holder, user LEDs, and so on.
As a final platform, the carrier board has a
.dts file that includes one of the ConnectCore 6 Plus system-on-module
The SBC can assemble different variants of the ConnectCore 6 Plus system-on-module, so the common hardware of the SBC is described in a
Common hardware for ConnectCore 6 Plus SBC
Final platform files
The final platforms are described in board-specific
|File||Digi product smart part number||CPU family||Wi-Fi||Bluetooth|
The following graphic illustrates the composition of a
Device tree selection during boot process
Digi Embedded Yocto builds the different device tree files (
.dts) for different boards and SOM variants into binary device tree blobs (
The device tree blobs are placed inside the linux partition along with the kernel binary.