Description: The Flattened Device Tree (FDT) is a data structure used to describe the hardware of a system. Its design allows the operating system and other programs to access information about connected devices efficiently and in an organized manner. Unlike other methods of hardware description, the FDT is presented in a hierarchical format that facilitates the identification of components and their properties. This structure is particularly useful in embedded systems and hardware architectures where flexibility and portability are essential. The FDT is based on a plain text format that can be easily read and modified, making it a valuable tool for developers and system administrators. Additionally, its use has extended into the realm of virtualization, where it integrates with emulators and hypervisors to provide an accurate representation of virtualized hardware. In summary, the FDT is an effective solution for hardware description that enhances interoperability and device management across various technological environments.
History: The concept of the Flattened Device Tree (FDT) was introduced in the 1990s as part of the development of the Linux operating system for specific hardware architectures, particularly in embedded systems. Its evolution has been marked by the need for a more flexible and portable representation of hardware, leading to its adoption across various platforms. Over the years, the FDT has been improved and standardized, becoming an integral part of the infrastructure of many modern operating systems.
Uses: The FDT is primarily used in operating systems to describe hardware in embedded systems and specific hardware architectures. It is also employed in virtualization environments, where it allows for accurate emulation of devices. Additionally, the FDT facilitates the configuration and management of devices in systems that require high portability and flexibility.
Examples: An example of FDT usage can be found in devices like the Raspberry Pi, where it is used to describe hardware components and allow the operating system to interact with them efficiently. Another case is its implementation in QEMU and other virtualization platforms, where the FDT is used to emulate hardware from various architectures, enabling developers to test software in virtualized environments.
