Secure Boot for Automotive Systems: RAPIDSEA Case Study

𝗗𝗮𝘆 𝟯𝟰 of #100DaysOfEmbedded 𝗝𝗧𝗔𝗚 / 𝗢𝗽𝗲𝗻𝗢𝗖𝗗 When breakpoints fail, flash won’t program, or the CPU refuses to halt, the issue is often not the firmware but the debug setup. Common pitfalls: * 𝗕𝗿𝗲𝗮𝗸𝗽𝗼𝗶𝗻𝘁���� 𝗶𝗻 𝗳𝗹𝗮𝘀𝗵 𝗮𝗿𝗲 𝗹𝗶𝗺𝗶𝘁𝗲𝗱 MCUs usually have only a few hardware breakpoint comparators * 𝗙𝗹𝗮𝘀𝗵 𝗽𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗱𝗲𝗽𝗲𝗻𝗱𝘀 𝗼𝗻 𝘁𝗵𝗲 𝗰𝗼𝗿𝗿𝗲𝗰𝘁 𝗱𝗿𝗶𝘃𝗲𝗿 -> wrong configuration silently fails * 𝗛𝗶𝗴𝗵 𝗮𝗱𝗮𝗽𝘁𝗲𝗿 𝘀𝗽𝗲𝗲𝗱𝘀 can make the JTAG link unstable * 𝗥𝗲𝘀𝗲𝘁 𝗯𝗲𝗵𝗮𝘃𝗶𝗼𝗿 𝗱𝗶𝗳𝗳𝗲𝗿𝘀 𝗽𝗲𝗿 𝗯𝗼𝗮𝗿𝗱 (SRST, TRST, or software reset) 𝗣𝗿𝗮𝗰𝘁𝗶𝗰𝗮𝗹 𝘁𝗶𝗽𝘀: * Reduce 𝗮𝗱𝗮𝗽𝘁𝗲𝗿 𝘀𝗽𝗲𝗲𝗱 if debugging becomes unreliable * Use 𝗿𝗲𝘀𝗲𝘁 𝗵𝗮𝗹𝘁 to catch code early in boot * Always check 𝗢𝗽𝗲𝗻𝗢𝗖𝗗 𝗹𝗼𝗴𝘀 when things behave strangely What OpenOCD trick has saved you in the past? #EmbeddedSystems #OpenOCD #JTAG #Debugging #Firmware #100DaysOfEmbedded

Most embedded crashes don’t come from logic errors. They come from stack misuse. Every function call: -> consumes memory -> grows the stack And with recursion or deep calls… 💥 Stack overflow → Hard fault 📄 I’ve broken this down in a simple PDF. 💬 What’s the hardest bug you’ve debugged in firmware? #EmbeddedSystems #Debugging #EmbeddedC

Establishing Root of Trust in Gateway Domain Controller Using Secure Boot! 🔐   RAPIDSEA-Rapid Product Development Suite prevented unauthorized firmware execution in the Gateway Domain Controller by enabling secure boot, securing flash programming, and strengthening UDS communication.🛡️   Dive into the full case study ➡️ https://lnkd.in/gvq46sWt   Reach out to RAPIDSEA for implementation support ➡️ https://lnkd.in/gGCt45Pa   #EmbeddedSystems #VehicleSecurity #RH850Platform #SecureBoot #AUTOSARCompliance #UDSProtocol #AutomotiveCaseStudy #RAPIDSEA #PoweredByEmbien #EmbienTechnologies

A few years back, gatttool was removed from BlueZ. I never got over it. It was my go-to CLI tool for interacting with BLE devices. It was simple, scriptable, and referenced in many BLE tutorials and security write-ups. Then it was just... gone. I've been wanting to resurrect it for years. Today I finally did. 🛠 Announcing gRATttool — a Rust reimplementation of gatttool that: ✅ Produces identical output to the original (drop-in replacement) ✅ Uses the modern BlueZ D-Bus API instead of deprecated raw sockets ✅ Adds enhancements the original never had:   → Built-in BLE device scanning (--scan)   → Full GATT enumeration table view (--enumerate)   → ASCII output modes (-A, -X)   → Direct ASCII string writes (-S)   → Pure Rust MAC spoofing (--bdaddr) Fully tested against BLE CTF. Safe Rust. No C dependencies beyond libdbus. For anyone doing BLE pentesting, reverse engineering, or CTF work on Linux, this one's for you. 🔗 https://lnkd.in/gmBgpEhu #BLE #InfoSec #RustLang #OpenSource #BLECTF #Bluetooth #SecurityResearch

With #CODESYS runtime v3.5.21.40 on the latest 4.1.0 groov firmware, you might be interested in setting up your serial module in CODESYS. To learn more about that, check out today's #FridayForum post: https://op22.co/4bfVlni

One of the most frustrating parts of studying for IT certifications is mastering subnetting. It's a complex topic that requires a lot of practice and memorization to get right. Our free Subnetting Cheat Sheet is here to help, providing an interactive way to learn and practice IPv4 subnet masks, CIDR notation, and host calculations all in one place. Best of all, it's completely free and runs right in your browser, so you can access it anywhere.

In C++,using a std::mutex to manage shared data is a common pattern, but it introduces overhead. When a thread fails to acquire a mutex, it may be put to sleep by the OS. This process triggers a context switch, which flushes registers, clears the cache lines, and increases latency. an alternative to blocking synchronization is Lock-Free Programming with CAS (Compare-And-Swap). 🔹 The Atomic Check (compare_exchange_weak): This technique leverages a single CPU instruction (CMPXCHG on x86). We instruct the CPU to update the value in memory only if it matches our expected value, ensuring an uninterruptible, atomic check-and-swap. 🔹 The Zero-Blocking Loop: If the CAS operation fails because another thread modified the value first, the current thread is not suspended. Instead, it stays active on the core, updates its expected state, and immediately retries the operation in a loop (spinning). 🔹 Deterministic Flow: By eliminating OS-level arbitration and thread suspension, we maintain Cache Locality and eliminate the performance jitter associated with blocking synchronization. #CPP #Multithreading #LowLatency #HighPerformance #LockFree #SystemsProgramming #SoftwareEngineering #PerformanceOptimization

EDK2 Full‑stack UART16550 implementation explanation In the write‑up I cover: The end‑to‑end stack: UART16550 HW → UartLib / SerialPortLib → SerialIo protocol → console → Shell How each layer talks to the next and where baud is actually applied Using a single NVRAM‑backed or CMOS baud variable that SEC/PEI SerialPortLib, DXE drivers, and Shell all honor A flow where changing baud in Shell takes effect immediately and persists across power cycles, including early PEI debug output If you’re into UEFI, firmware bring‑up, or low‑level debugging, this kind of full‑stack view can make serial behavior much more predictable. 👉 Full article is on Substack #UEFI #Firmware #EDK2 #UART #FullStack #EmbeddedSystems #SerialConsole #LowLevelProgramming #Debugging

Day 20: System Calls Yesterday, we locked User Programs inside a Ring 3 sandbox so they couldn't crash the kernel. But that created a new problem: how do isolated programs actually do anything if they aren't allowed to touch the hardware? today, I built a Syscall Interface (Interrupt 0x80) this required creating an assembly stub to catch the interrupt, a C handler to parse the registers, and a secure API bridge. What’s happening in the image: * a User Mode program wants to print text to the VGA screen * it cannot do it directly (Ring 3 restriction) * it places the "Print" command number into the EAX register and triggers int 0x80 * the Kernel (Ring 0) intercepts the request, safely executes the print command, and hands control back * Result: a successful, secure handshake between User Space and Kernel Space! Just load registers -> trap to kernel -> execute -> return -> success #OperatingSystems #OSDev #x86 #KernelDevelopment #LowLevelProgramming #Syscalls #ComputerArchitecture #SystemsProgramming #CProgramming #GCC #NASM #QEMU

See more. Debug faster! After a long wait, pre-orders are finally open for the USB Sniffer LS/FS/HS with Wireshark Interface! It enables capture and analysis of low-, full-, and high-speed USB traffic, with Wireshark support to make investigation, debugging, and reverse engineering more accessible in day-to-day engineering work. We have tested the prototype units, finalized the documentation, and successfully completed validation. With production underway, shipping is expected by the end of April 2026. Pre-order your USB Sniffer today! https://lnkd.in/dciuGXAh