What are the differences between nuttx and linux?

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The differences between nuttx and linux are as follows: 1. nuttx is a real-time embedded operating system, which is used in the microcontroller environment, while linux is a UNIX-like operating system that is free to use and spread freely; 2. Nuttx root file system is a pseudo file system, and the real file system can be mounted in the pseudo file system, while linux root file system is a real file system, and the pseudo file system is mounted in the real root file system.

Operating environment of this tutorial: linux7.3 system and Dell G3 computer.

The difference between nuttx and linux nuttx

Nuttx is a real-time embedded operating system (RTOS), which is very compact and used in microcontroller environment. Nuttx is fully scalable from small (8-bit) to medium-sized embedded (32-bit) systems. It is also designed to be fully compliant with POSIX standards, completely real-time, and completely open.

Linux

Linux, full name GNU/Linux, is a Unix-like operating system that is free to use and spread freely. Its kernel was first released by Linus Benedict Torvalds on October 5th, 1991. It was mainly inspired by the ideas of Minix and UNIX. It is a POSIX-based multi-user, multi-task, multi-threaded and multi-CPU operating system. It can run major Unix tools, applications and network protocols. It supports 32-bit and 64-bit hardware. Linux inherits the network-centric design idea of Unix and is a multi-user network operating system with stable performance. There are hundreds of different distributions of Linux, such as debian and archlinux based on community development, and Red Hat Enterprise Linux, SUSE and Oracle Linux based on commercial development.

introduce

File system is a mechanism to organize data and metadata on a storage device. It is a subsystem of operating system to manage persistent data and provide data storage and access functions.

The process of associating a file system with a storage device is called mount. When mounting, a file system will be attached to the current file system hierarchy (root). When mounting, the file system type, file system and a mount point need to be provided. 1.1 introduction of nuttx file system

Nuttx contains an optional and extensible file system, which can be completely omitted. Nuttx does not depend on the existence of any file system. Pseudo root file system

You can enable the pseudo file system in this memory by setting config _ nfile _ descriptor OS to a non-zero value. It is an in-memory file system because it does not need any storage media or block driver support. File system content is generated in real time through standard file system operations (open, close, read, write, etc.). In this sense, it is a pseudo file system (Linux /proc is also called pseudo file system).

Any data or logic provided by the user can be accessed through the pseudo file system. Supports the built-in of character device drivers and block device driver nodes in any directory of the pseudo file system, but by convention, they are used to being placed in the /dev pseudo file system directory.

File system mount

A simple in-memory file system can be extended by mounting block devices, which provide support for mass storage devices to achieve real file system access. Nuttx supports the standard mount () command, which allows a block driver to bind a file system to a mount point in a pseudo file system. At present, Nuttx supports VFAT file system.

Compared with Linux

From the programming point of view, Nuttx file system looks very similar to Linux file system, but there is a fundamental difference: Nuttx root file system is a pseudo file system, and the real file system can be mounted in the pseudo file system; In contrast, in a typical Linux installation, the Linux root file system is a real file system, and the pseudo file system is mounted in the real root file system. Nuttx's method is designed to provide support from a very small platform to a medium platform, so as to have better scalability.

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