Before discussing the boot process, let’s briefly talk about the learning path for digital ICs. There are many directions in digital IC design, including processor chip design, memory chip design, logic chip design, and so on. Ultimately, we find that digital chip systems generally encompass three functions: storage, transmission, and computation. The value of a … Read more
GRUB encryption can protect the integrity of the system boot process,preventing unauthorized access to the system in single-user mode to tamper with the file system. Note: 1. This article is for learning purposes only; please do not criticize if you dislike it. 2. The experimental environment is CentOS 7. 3. There is no absolute security, … Read more
When you gently press the power button, eagerly awaiting the Linux system interface to appear, have you ever wondered what journey the underlying hardware undergoes in those few seconds? This is not a simple loading process, but an epic journey from the 16-bit “primitive era” to the 64-bit “modern civilization”. Today, let us become witnesses, … Read more
The Linux boot process is one of the core aspects of the operating system, involving multiple stages such as hardware initialization → boot loading → kernel loading → user space initialization. Understanding the boot process not only aids in troubleshooting (e.g., system not booting, getting stuck at a certain stage) but also helps operations personnel … Read more
Many people can recite the rough steps of “BIOS -> GRUB -> Kernel -> init”, but when it comes to digging deeper, they often falter. Below, I will break down the Linux boot process in detail and highlight those easily overlooked but crucial core knowledge points, which are key to standing out in interviews. Overview … Read more
Senior BIOS expert Jeff brings you an introduction to RISC-V. This includes the boot process of RISC-V, which many people are concerned about, as well as some practical applications of RISC-V firmware. Enjoy!
1. What is the Boot Process? When we press the power button, how does the RK3399 transition from “nothing” to entering the Linux system? This entire process is called the “boot process.” This can be likened to our daily waking up process: Open Eyes (BootRom) → Get Up and Get Dressed (Bootloader) → Eat and … Read more
Kernel Boot Stage 1. bootsect stage 2. setup stage 3. head.S stage 4. main.c stage Init Stage 1. Determine User Login Mode In “/etc/inittab”, the following login modes are listed: single-user maintenance mode, multi-user without network mode, text interface multi-user mode, and X-Windows multi-user mode. The single-user maintenance mode (runlevel 1) is similar to “Safe … Read more
Thoughts: 1. When the SOC powers on, does only one core start, or do all cores start? 2. If only one core starts when the SOC powers on, where is the entry point for that core? 3. What is a cold boot? When is a warm boot used? In what scenarios would a warm boot … Read more
More content can be added to the Linux system knowledge base package (tutorials + videos + Q&A). Back to school season “Linux Driver Comprehensive Course” promotion. Table of Contents 1. Linux Kernel Boot Process Flowchart 2. Self-Extraction Phase 3. Kernel Entry Point 4. Assembly Phase 5. C Function Phase 6. Kernel Boot Scene 7. Executing … Read more