The importance of Linux DTS in system development

Linux DTS, the abbreviation of Linux Device Tree, is a data structure that describes hardware platform resource information. It is an important part used to initialize the hardware when the Linux kernel starts. In system development, the writing of Linux DTS is very important because it defines various attributes and relationships of hardware devices in the Linux system, provides the Linux kernel with correct hardware information, and ensures the correct operation of the system.

First, let us understand the basic structure of the Linux device tree. A simple DTS file usually consists of the following parts:

1. Header information: Contains device tree version, manufacturer name, root node and other information.
2. Device node: describes the attributes of each hardware device, such as device type, device address, interrupt information, etc.
3. Bus node: describes the connection relationship between hardware devices, such as the parent-child relationship of the device, the connection relationship between the device and the bus, etc.
4. Special nodes: describe some special hardware resources, such as clocks, interrupt controllers, etc.

Next, let’s look at a simple DTS example to show its importance in system development:

/dts-v1/;
/ {
    compatible = "myboard";

    cpus {
        #address-cells = <1>;
        #size-cells = <0>;
        cpu@0 {
            compatible = "arm,cortex-a53";
            device_type = "cpu";
            reg = <0>;
            clock-frequency = <1000000000>;
        };
    };

    memory {
        device_type = "memory";
        reg = <0x00000000 0x80000000>;
    };

    serial@12345678 {
        compatible = "my-uart";
        reg = <0x12345678 0x100>;
        interrupt-parent = <&intc>;
        interrupts = <0>;
        status = "okay";
    };

    intc: interrupt-controller {
        compatible = "my-intc";
        #interrupt-cells = <2>;
    };
};

In this simple example, we define a The device tree named "myboard" includes hardware resources such as a CPU, memory, serial port, and interrupt controller. Each device node contains attribute information related to the device, such as device type, register address, interrupt information, etc. Through such a device tree description, the Linux kernel can correctly initialize each hardware device based on this information to achieve the correct operation of the system.

In system development, it is very important to write Linux DTS properly. Correct device tree description can ensure that hardware resources are correctly initialized and used, avoid hardware-related problems, and improve system stability and performance. Therefore, during the development process, developers need to carefully write DTS files and flexibly adjust them according to the characteristics of the specific hardware platform to ensure that the system works properly.

In short, the importance of Linux DTS in system development is self-evident. By properly writing DTS files, exact hardware information can be provided to the Linux kernel to ensure the normal operation of the system. We hope that the above content can help readers gain a deeper understanding of the role and importance of Linux device trees and DTS, and further improve the efficiency and quality of system development.

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