Embedded Linux development practice (2): uboot+kernal development

 Why do we need to use Linux? Isn’t it possible to use infinite loops on MCUs in the past? Obviously there is a need for multitasking.

·Linux是一个免费的开源操作系统
·Linux可以在各种CPU上运行
·Linux有一个结构良好的内
·Linux是一个高度安全的操作系统
·Linux操作系统永远不会崩溃，除非有任何硬件问题
·Linux内核中易于编写的设备驱动程序
·Linux支持的广泛软件
·Linux支持x86, ARM, PowerPC, MIPS, SuperH, m68k等架构
·Linux从PC X86移植到嵌入式芯片架构下如ARM，代码占用空间从500M减少到10 MB以下，这是embedded Linux system开发最重要的一步。

嵌入式linux包括：
Cross development toolchain ( installed on a host system)
Bootloader
Kernel
Device Tree
Root file system
System Programs
Applications

In addition to cross-compilation, you also need to understand how to perform embedded Linux programming. You must know the system startup boot process: