Embedkari Comprehensive Linux Training Roadmap
[ PHASE 1: USER-SPACE ] ──> [ PHASE 2: CORE KERNEL ] ──> [ PHASE 3: PLATFORM BUILD ] ──> [ PHASE 4: ADVANCED KERNEL ]
• Linux App Development • Linux Fundamentals • Bootloader Porting (U-Boot) • Advanced Device Drivers
• Process & Thread Control • Character Device Drivers • Yocto Build System • Platform Bus & DTS Mapping
• Synchronizations & IPCs • Memory Boundary (User/Kernel) • Target SBCs (RPI, BBB, Jetson) • Interrupts & IRQ Handling
Phase 1: Linux Application Development
- System Programming & Tools: Writing C applications using the standard GNU toolchain (GCC, Makefiles) and debugging execution behaviors using GDB.
- Process & Thread Management: Mastering multi-threading, concurrent execution, process creation (
fork,exec), and POSIX threads (pthreads). - Concurrency Protection: Implementing mutexes, semaphores, and condition variables to prevent race conditions across concurrent processes.
- Inter-Process Communication (IPC): Setting up shared memory, pipes, message queues, and Network Socket Programming to pass data between isolated application layers.
Phase 2: Linux Fundamentals with Char Drivers
- Kernel Foundations: Studying virtual file system (VFS) layers, memory management models, and the internal life cycle of standard system calls.
- Loadable Kernel Modules (LKMs): Writing separate C modules that can be dynamically inserted (
insmod) or removed (rmmod) from a running kernel. - Character Device Drivers: Building custom char drivers to map user-space file operations (
open,read,write,close) directly to virtual memory or physical registers via thefile_operationsstructure. - User-Kernel Data Boundary: Safely transferring data payloads across isolated spaces .
Phase 3: Bootloader Porting, Target Hardware & Yocto Integration
- Bootloader Porting: Analyzing the multi-stage hardware initialization sequence (ROM Code → SPL → U-Boot). You practice modifying
uEnv.txtboot scripts, configuring DDR RAM parameters, and adjusting kernel arguments (bootargs) to pass control over to the OS. - Yocto Project Integration: Moving away from manual compilation to master automated image generation using Poky, BitBake, and OpenEmbedded Layers. You write custom recipes to package your applications and configure minimal, enterprise-grade root filesystems.
- Target Platforms Deployment: Cross-compiling, flashing, and testing your integrated images directly onto one of the specific hardware architectures :
- Raspberry Pi (RPI): Handling the Broadcom SoC boot sequence, managing device tree overlays, and writing drivers to toggle GPIO subsystems.
- BeagleBone Black (BBB): Interfacing with the TI AM335x ARM Cortex-A8 chip.
- NVIDIA Jetson Nano: A case study for embedded linux.
Phase 4: Advanced Kernel Development
- Advanced Device Driver Architectures: Writing and parsing Device Tree Source (DTS) files to explicitly map hardware addresses, pins, and clock configurations directly to your driver code.
- Platform Device Drivers: Utilizing the Linux Platform Bus framework to seamlessly bind custom kernel drivers to target physical hardware peripherals on the SBC.
- Subsystem Core Frameworks: Interfacing your custom drivers with standard kernel subsystems (such as the generic GPIO or I2C core) to register control loops using official kernel APIs.
- Interrupt Handling (IRQs): Registering Interrupt Service Routines (ISRs) inside the kernel and managing background processing using Top-Half/Bottom-Half mechanisms like Tasklets or Workqueues.
- Kernel Memory Allocation: Managing physical and virtual address spaces within your custom kernel code.
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