title: [Writing an OS Kernel from Scratch] 336 – U-Boot Porting: Getting Your Dev Board Running from Zero category: os tag: [u-boot, embedded, arm, porting] source: https://github.com/golang12306/os-kernel-from-scratch [Writing an OS Kernel from Scratch] 336 – U-Boot Porting: Getting Your Dev Board Running from Zero 1. The Essence of U-Boot Porting U-Boot porting is essentially making... » read more

H09 — How Memory Modules Are Manufactured: PCB, Soldering, and Testing Key Insight: Behind every reliably working memory module is a strict quality screening. Memory Module Manufacturing Flow The complete flow from components to finished memory module: 内存条制造流程： 1. PCB 生产 - 采购空白 PCB（6~8 层，DDR4/DDR5 规格） - 沉金（ENIG）表面处理（金手指镀金） - 丝印（Silkscreen）印刷 2. 零件准备 - DRAM 颗粒：按频率/品质分级（三星... » read more

A12 — The Complete Journey of the Memory System: From Physical to Virtual to Application Key Insight: The only way to understand memory is to trace the complete journey of data from hardware to application. Five-Layer Panorama of the Memory System 内存系统的分层结构： [应用层] malloc / new / mmap │ ▼ [用户态分配器] ptmalloc / tcmalloc /... » read more

K03 — Memory Copy During Process Creation: copy_page_range and COW Details Key Insight: The elegance of fork lies in turning “copying” into “sharing, until it must be otherwise”. Memory Copy Flow in fork The core of fork is copy_process. The memory-related part is copy_mm, which calls copy_page_range to copy the parent’s address space. fork 内存复制的调用链：... » read more

355 | Virtual Memory: From CR3 to Complete Page Table Setup Key Insight: Without virtual memory, the kernel cannot even protect itself. The security foundation of the entire modern OS rests on a single register — CR3. 1. There Must First Be Someone, Then There Is a Virtual Address The previous article covered how the... » read more

Writing an OS Kernel from Scratch | MBR Partition: How Disks Are Sliced Into Blocks and How Multi-Boot Systems Coexist Have you ever had this experience: You buy a new hard drive, plug it into your computer, open the disk management tool, and see a blank slate with “Unallocated” written on it — then you... » read more

Writing an OS Kernel from Scratch — A Book to Understand the Operating System Core About This Book This is a hands-on tutorial about writing an operating system kernel from scratch. The operating system textbooks on the market are either thick theory books that put you to sleep after a few pages, or directly dump... » read more