What is the difference between nuttx and linux

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

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is the difference between nuttx and linux

nuttx

Nuttx is a real-time embedded operating system (Embedded RTOS). It is very small and in micro used in the controller environment. Nuttx is fully scalable from small (8-bit) to medium-sized embedded (32-bit) systems. It is also designed to be fully POSIX compliant, fully real-time, and fully open.

Linux

Linux, the full name is GNU/Linux, is a UNIX-like operating system that is free to use and freely disseminated. Its kernel was designed by Linus Benardi First released by Kurt Torvalds on October 5, 1991, it is mainly inspired by the ideas of Minix and Unix. It is a POSIX-based multi-user, multi-tasking operating system that supports multi-threading and multi-CPU. It can run major Unix software tools, applications and network protocols. It supports 32-bit and 64-bit hardware. Linux inherits the network-centric design philosophy of Unix and is a multi-user network operating system with stable performance. There are hundreds of different Linux distributions, such as Debian and Archlinux based on community development, and Red Hat Enterprise Linux, SUSE, Oracle Linux, etc. based on commercial development.

Introduction

The file system is a mechanism for organizing data and metadata on a storage device. It is a subsystem of the operating system that manages persistent data. Provides data storage and access capabilities.

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

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

This in-memory pseudo-file system can be enabled by setting CONFIG_NFILE_DESCRIPTOS to a non-zero value. It is an in-memory file system in that it does not require any storage media or block driver support. File system content is generated in real time via standard file system operations (open, close, read, write, etc.). In this sense, it is a pseudo file system (Linux's /proc is also called a pseudo file system).

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

File system mount

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

Comparison with Linux

From a programming perspective, the Nuttx file system looks very similar to the Linux file system, however, there is one fundamental difference: the Nuttx root A file system is a pseudo file system, and a real file system can be mounted in a pseudo file system; in contrast, in a typical Linux installation, the Linux root file system is a real file system, and a pseudo file system is mounted In the real root file system. The approach chosen by Nuttx is designed to provide support from very small platforms to medium platforms for better scalability.

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