What does linux mtd mean?

MTD is a memory subsystem provided by the Linux kernel. It is a memory subsystem specially used on embedded devices. It allows users to read and write Flash devices in user space just like reading and writing ordinary files. MTD is based on Page, that is, each read and write is performed in Page units; MTD supports multiple Flash types, including NOR Flash and NAND Flash.

The operating environment of this tutorial: windows7 system, mysql8 version, Dell G3 computer.

MTD (Memory Technology Device) is a memory subsystem specially used on embedded devices. It allows users to read and write Flash devices in user space just like reading and writing ordinary files. This article will introduce the relevant knowledge of Linux user space MTD in detail, including MTD overview, MTD driver, MTD partition, MTD file system, MTD tools, etc.

1. Overview of MTD

MTD is a memory subsystem provided by the Linux kernel, which allows users to read and write in user space like ordinary files. Flash device. Unlike traditional block devices, MTD is based on Page, that is, each read and write is performed in Page units. MTD supports multiple Flash types, including NOR Flash and NAND Flash.

2. MTD driver

MTD driver is a bridge connecting hardware and software. It is responsible for abstracting the hardware into an interface suitable for use by the Linux kernel. MTD drivers are divided into two types: bottom-layer drivers and upper-layer drivers. The low-level driver is responsible for communicating with the hardware, and the upper-level driver is responsible for providing the file system interface.

3. MTD partition

MTD partition divides the Flash device into multiple logical blocks, and each logical block can be read and written independently. Normally, a physical block is divided into multiple logical blocks, and each logical block corresponds to a virtual address. In the Linux kernel, MTD partitions can be defined through the mtd_partitions structure.

4. MTD file system

In Linux, you can use JFFS2, UBIFS and other file systems to manage MTD devices. data. These file systems can be operated directly on Flash devices and support compression, defragmentation and other functions.

5. MTD tools

The Linux kernel provides multiple tools to manage and test MTD devices. These include nanddump, nandwrite, flashcp and other tools Linux user space mtd, which can be used to read and write data in Flash devices; tools such as mtd_debug and mtdinfo can be used to debug and view MTD device information.

6. MTD application cases

Currently, MTD memory subsystems are used in many embedded devices. For example, routers, wireless TV boxes, smart homes, etc. On these devices, the MTD memory subsystem is widely used in firmware updates, configuration storage, and logging.

7. MTD research progress

In recent years, there have been many new developments in MTD memory subsystems. For example, UBI (Unsorted Block Images) is a new flash memory management method that can improve the life and reliability of flash memory; in addition, FTL (Flash Translation Layer) technology is also widely used in flash memory controllers.

Related recommendations: "Linux Video Tutorial"

The above is the detailed content of What does linux mtd mean?. For more information, please follow other related articles on the PHP Chinese website!