PCIe, BAR0, and DMA Explained with QEMU
Published at September 24, 2025 · 9 min read
Deep dive into how PCIe BAR0 registers control DMA engines, how devices become Bus Masters, and how to debug the logic with QEMU and Linux kernel drivers.
Blog – Embedded Systems, Linux & Technology Insights
👋 Embedded Systems & Linux Blog — Yair Gadelov
Here I share in-depth articles, practical guides, and personal insights from my work in embedded systems, Linux/Yocto BSP development, real-time firmware, and system-level software engineering.
You’ll also find explorations of adjacent domains — from kernel drivers and PCIe bring-up to data pipelines, machine learning for trading, and software architecture best practices.
Typical topics include:
- Board bring-up & BSP development — Yocto, device trees, kernel drivers, bootloaders.
- Real-time firmware & RTOS — Zephyr, FreeRTOS, deterministic scheduling.
- System architecture & integration — combining microcontrollers, SoCs, and Linux.
- Software update & deployment — secure boot, FOTA, SWUpdate/RAUC.
- Tools & automation — Python SDKs, test frameworks, CI/CD for embedded.
- Technology & finance — algorithmic trading, data pipelines, and modeling.
This blog is both a knowledge base and a personal journal of my engineering journey —
from hands-on hardware bring-up to complex embedded Linux platforms and beyond.
Modular Data Injection Architecture for Embedded Systems
Published at September 5, 2025 · 5 min read
Designing a flexible and portable interface-based architecture for managing data injection across MCUs, Embedded Linux, and mock environments.
SWUpdate: build, sign & install a minimal .swu that updates only an app + config
Published at July 26, 2025 · 6 min read
Everything you need to reliably create, sign, (optionally encrypt), verify and install a .swu with SWUpdate — plus Lua/postinstall hooks, hashes, handlers, and troubleshooting.
Secure Boot Path: From BootROM to Userspace in ZynqMP and i.MX8
Published at July 18, 2025 · 5 min read
Understanding secure boot validation flow, FIT signatures, eFUSE keys, and runtime integrity from SoC reset to Linux userspace. Includes comparison between Xilinx ZynqMP and NXP i.MX8.
Securing U-Boot with FIT Signature and Key Injection on ZynqMP
Published at July 17, 2025 · 4 min read
Step-by-step guide to configure secure boot in U-Boot using FIT signatures, public key injection, and Yocto integration for ZynqMP and similar SoCs.
Installing Xen Support on Xilinx ZynqMP
Published at July 15, 2025 · 3 min read
Install Xen on Xilinx ZynqMP (ZCU102 Rev 1.1) using Yocto build with manual boot script and DTB setup. Step-by-step guide for SD card boot and static IP configuration.
Data streaming between two BLE devices: PSoc6 and nRF52832
Published at September 10, 2022 · 3 min read
Setup a peripheral-central BLE connection between Psoc6 and nRF52832 and stream data between them.
Published at March 3, 2022 · 2 min read
Implementation of WebSockets in c++ using lib WebSockets (lws) . There is a demo for Binance and Bitstamp.
Published at February 23, 2022 · 5 min read
Implementation of general-purpose use REST API server in c++ using restbed library
Published at November 18, 2021 · 3 min read
Simple steps to setup SD card on stm32 MCU