Embedded Linux Interview Prep: 600 Most Asked Questions-2026

This course is meticulously designed to help engineers and professionals prepare for technical interviews and assessments in the field of Embedded Linux Development. Through over 600+ carefully curated questions, the course provides deep insights, real-world context, and conceptual clarity across all core domains required for mastering embedded systems powered by Linux.

Whether you're targeting roles involving kernel development, device driver integration, real-time systems, or build automation, this course provides the breadth and depth needed to build and validate your expertise.

Who Should Take This Course?

• Embedded Linux developers preparing for technical interviews

• Firmware engineers transitioning to Linux-based systems

• Final-year engineering students interested in system-level software

• Professionals working on BSPs, device drivers, or build pipelines

• Anyone pursuing Yocto, Buildroot, or U-Boot project roles

What You’ll Learn (Syllabus)

1. Embedded Linux System Architecture
• Linux kernel architecture: monolithic vs microkernel
• Role of bootloader, kernel, root filesystem
• User space vs kernel space concepts
• Device Tree structure and overlays
• Understanding U-Boot and GRUB

2. Linux Kernel and Device Drivers
• Kernel configuration and compilation
• Kernel modules vs built-in drivers
• Writing and loading kernel modules using insmod, rmmod, modprobe
• Character vs block drivers
• Platform drivers and device tree integration
• Interrupt handling: ISRs, bottom half, tasklets, work queues
• GPIO, I2C, SPI, UART driver interfaces

3. Bootloader (U-Boot Focus)
• Bootloader stages: SPL, U-Boot proper
• U-Boot environment variables
• Porting U-Boot to custom hardware
• Booting via MMC, NAND, TFTP, NFS
• Scripted booting with bootcmd and bootargs

4. Root Filesystem and Build Systems
• Filesystem types: ext4, squashfs, jffs2, ubifs
• Creating minimal root filesystems with BusyBox
• Build systems overview: Yocto, Buildroot, OpenEmbedded
• Init systems: systemd, SysVinit

5. Toolchain and Cross-Compilation
• Cross-compiling vs native compiling
• Toolchain components: GCC, binutils, glibc, GDB
• Using toolchains from Yocto or Buildroot
• Common linking and runtime error fixes
• Architecture-specific optimizations for ARM, MIPS, RISC-V

6. Debugging and Performance
• GDB remote debugging using gdbserver
• Logging with printk and analyzing kernel logs using dmesg
• Performance profiling using ftrace, perf, systemtap
• Valgrind and kmemcheck for memory issues
• Boot log analysis and serial console-based debugging

7. Networking and Protocols in Embedded Linux
• TCP/IP stack internals and Ethernet basics
• Lightweight IoT protocols: MQTT, CoAP
• NFS and TFTP setup for development
• Network tools: ifconfig, ip, netstat, ping, traceroute, tcpdump
• Writing simple socket programs

8. Security and Hardening
• Secure boot with U-Boot and TPM integration
• Filesystem-level security: permissions, SELinux, AppArmor
• Kernel hardening: seccomp, ASLR, stack protection
• Secure firmware updates using RAUC and Mender

9. Real-Time Linux
• PREEMPT-RT patch vs standard kernel behavior
• Real-time scheduling policies: FIFO, RR, Deadline
• Latency and jitter measurement tools
• Writing real-time applications using pthreads and timerfd

10. Interfacing and Peripherals
• Controlling GPIO, I2C, SPI via /sys and /dev interfaces
• Writing user-space drivers with mmap
• Interfacing ADCs, DACs, and sensors
• Using the USB gadget framework
• Serial communication and RS-485 handling

11. Embedded Linux Application Development
• Multithreading with POSIX threads
• IPC mechanisms: pipe, FIFO, shared memory, message queues
• Signals and proper signal handling
• Daemon creation and init script basics
• File I/O and memory-mapped file operations

12. Version Control and CI/CD for Embedded Projects
• Git workflows: rebase, bisect, submodules
• CI tools overview: Jenkins, GitHub Actions, GitLab CI
• Automated builds using Yocto and Buildroot
• Embedded-focused testing: Robot Framework, Linux Test Project (LTP)

This course provides an unmatched collection of interview-centric practice material, ensuring that you're well-prepared for embedded software developer roles across industries such as automotive, industrial automation, IoT, medical devices, and defense systems.