Resilient systems built with a
craftsman’s mindset.
Crusan & Co. is an engineering studio on the Oregon coast focused on original systems development, published technical books, custom prototype hardware builds by direct inquiry, and product support—home of our flagship platform, AxisOS™.
What We Build
Deterministic software architectures, published technical guides, open-source developer tools, and custom field hardware built by Crusan & Co.
AxisOS™
The flagship platform of Crusan & Co.—a lightweight, freestanding operating system architecture engineered for RAM-resident execution on Raspberry Pi 4 and microcontroller edge nodes. Public evaluation previews and documentation are online today while release candidates undergo hardware validation.
Visit Flagship Site (axisos.pro) →Viewer Suite & Volume-1 Book
Volume-1: The RAID-5 Shelf (Edition 2.a) is shipping today in print and Kindle on Amazon alongside our public C/GTK3 AxisOS™ Viewer Suite binary inspector and companion repositories on GitHub.
View Open-Source Tools on GitHub →Analyzer & Command Matrix
Interactive architectural walkthrough of AxisOS™ syscall surfaces, RAMGAK memory bracketing, and local daemon topology (displays simulated browser preview responses when viewed outside a local AxisOS™ LAN).
Open Matrix Evaluation Preview →Prototype Field Kits
Custom-assembled hardware and software prototype builds engineered by Crusan & Co. around our AxisOS™ architecture. Commercial production kits are in preparation; custom bench builds are quoted selectively by direct inquiry.
View Kit Roadmap & Inquiry Details →Core Engineering Milestones
Built on our three foundational pillars—Honest, Auditable, and Owned—and engineered from first principles on the Oregon coast.
Systems that know what they don’t know. Ground truth over guesswork; no hallucinated certainty, no hand-waving.
Operations and code you can inspect at every layer—freestanding C99 and raw syscalls with zero black-box middleware.
You own the hardware and the unencumbered code outright. Zero cloud tether, zero subscriptions, zero phone-home licensing.
Executive Foreword: The Sovereign System Behind the System
Across our 2026 engineering chronicles, Crusan & Co. documented the design, calibration, hardening, and bench deployment of AxisOS™—a freestanding C99 direct-syscall operating system architecture designed to run cooperative local software agents without cloud dependencies, without corporate PKI baggage, and with unmounted runtime boot media to minimize flash wear and reduce power-loss corruption risk.
What began as an operator’s uncompromising refusal to accept third-party bloat, runaway cloud subscriptions, and brittle software frameworks crystallized into a local-first architecture. Grounded in Marc F. Crusan’s decades of production distributed systems experience—including high-throughput in-memory enterprise messaging—AxisOS™ prioritizes inspectable machine state:
- Pure Monolithic Kernel Syscalls: Direct assembly entry stubs (
crt0-bin.S,crt0-shell.S) issuing direct kernel supervisor calls (svc #0on aarch64,syscallon x86_64), eliminating libc overhead and producing compact, self-contained ELF binaries. - The Silicon Doctrine: RAM-resident execution on physical bare metal (Raspberry Pi 4 Model B). The system loads into LPDDR4 RAM via a compressed
axisos-initramfs.img. Step 2 is the permanent runtime state, leaving the physical micro-SD card unmounted and idle during normal operation to minimize flash wear and reduce sudden power-loss filesystem corruption risk. - RAMGAK Kinetics: The binary-search convergence protocol (O(log2 N)) that dynamically brackets and pins the in-memory
tmpfsworking space without guesswork. - The Out-of-Band Mutual Safeword Protocol: Air-gapped local authentication using out-of-band mutual challenge-response safewords over local loopback or physical serial wire, avoiding external Certificate Authorities and cloud revocation dependencies.
- Local Multi-Daemon Architecture: Specialized local daemons operating across dedicated loopback ports (
:8081Zero Mind,:8080Lite Vanguard,:8082AxisOS™ Sentinel) paired with optional local offline neural inference (:8088Qwen2.5) and a local Comms HUD (:8085). - Hardware Mesh Substrate: Node 001 (Mayor), an RP2350 Raspberry Pi Pico 2 W dual-homed on shop LAN and mesh subnets, broadcasting UDP
:50000discovery beacons on our local testbed. - Web Documentation & Evaluation Previews: Published at
https://axisos.proalongside an interactive browser-based Silicon Flasher evaluation preview.
1. Sovereign Bare-Metal Kernel, TinyOS & Zero-Libc Architecture
Both our compact Sovereign Bare-Metal AArch64 Kernel (axisos-native-kernel.img, booting directly from Raspberry Pi 4 start4.elf at 0x80000) and the Freestanding TinyOS Micro-Userland (axisos-initramfs.img) are original works engineered around Marc F. Crusan’s architecture—issuing raw svc #0 hardware supervisor calls directly to the kernel. There is no third-party OS kernel source, no multiplexed userland wrappers, no musl, no glibc, no third-party init, and no copyleft derivative code. Crusan & Co. holds exclusive authorship and commercial title across AxisOS™.
Original Architectural DNA
- Compact Bare-Metal Kernel: Original
boot.S,vectors.S, RFC 1951/1952inflate.c, VideoCore VI HDMI framebuffer,xHCIUSB HID, andGENETv5Ethernet + TCP/UDP/ICMP drivers under active bench validation. - Direct Syscall Stubs: Custom AArch64 assembly (
syscall-main.S,crt0-bin.S,crt0-shell.S) with hand-mappedlinker.ld. - RAM-Resident Daemons: PID 1 (
/sbin/init) launcheszero-core(:8081),agent-lite(:8080),axis-agent(:8082),axis-httpd, andaxis-mesh(:50000) directly in LPDDR4 RAM. - Zero-Bloat Stack: Zero-distro · Zero-wrapper · Zero-libc · Zero-imports · Zero-derivative.
Total Commercial & Licensing Freedom
- ✔ Unrestricted Licensing: Finalize sovereign auditable, dual-license, or permissive MIT tiers upon completion of field testing with zero external constraints.
- ✔ Commercial Roadmap: Prepare commercial hardware kits and custom field builds with zero third-party attribution baggage.
- ✔ Embed in Silicon: Deploy onto target SBCs and RP2350 micro-nodes with zero copyleft contamination.
- ✔ Publish Globally: Uncontested authorship across our code, firmware builds, and technical books.
Final public and commercial licensing terms for our flagship AxisOS™ ecosystem are currently under active consideration by Crusan & Co. while bare-metal hardware and field validation testing is conducted:
Candidate for permissive open-source (MIT) release upon completion of validation so independent developers, educators, and operators can adopt RAM-bracketing and local binary inspection.
100% exclusive IP of Crusan & Co. Final licensing for the Silicon Doctrine, the bare-metal kernel, and the TinyOS daemon suite is being finalized during field testing to pair source auditability and hardware ownership for customers with commercial reservation for Crusan & Co.
2. The Silicon Doctrine: Permanent In-Memory Execution
Conventional single-board operating systems treat initramfs as a temporary staging loader before pivoting (switch_root) onto removable micro-SD flash media—exposing the card to continuous background log wear and filesystem corruption on unexpected power loss. The AxisOS™ Silicon Doctrine skips the disk pivot: the compressed axisos-initramfs.img operating system loads directly into physical LPDDR4 RAM at boot. Step 2 remains the runtime home, and the micro-SD card stays unmounted and idle during normal operation.
LPDDR4 Silicon vs. MicroSD
- Memory-Bus Throughput: Operates across LPDDR4 system memory bandwidth rather than bottlenecking on removable serial flash I/O.
- Direct Silicon Access: Serves binaries, scratch files, and runtime logs directly from volatile RAM without flash wear-leveling stalls.
- Compact Runtime Footprint: Leaves ample physical memory headroom on 4GB and 8GB Raspberry Pi 4 boards for local agent workloads.
Power-Loss Resilience & axis-checkpoint
Because boot storage remains unmounted during normal runtime, background daemons do not continuously write to flash—significantly reducing the risk of SD filesystem corruption if power is interrupted outside an active save. Persistent state changes are committed strictly on operator command via /bin/axis-checkpoint.
3. The RAMGAK Memory Bracket Protocol
Rooted in a practical binary-search bracketing method that Marc F. Crusan has applied and taught for over 30 years—and wired into the AxisOS™ C/syscall layer alongside Antigravity (AGY)—the RAMGAK Memory Bracket (named from the letters of AGY & MARC) replaces static RAMDisk guesswork with simple field discipline. Starting from /proc/meminfo at half of physical RAM (MemTotal / 2), the operator steps up halfway if more room is needed or down halfway when spare headroom remains—repeating after each bracket until the right balance for the Triad is locked into /etc/rc.
Practical 5-Step Bracketing
- Hardware Discovery: Read addressable physical RAM (
MemTotal). - 50% Opening Bracket: Mount
tmpfsat half of physical memory. - Triad Staging: Launch Agent Zero (:8081), Lite (:8080), and Axis-Agent (:8082).
- Halve the Difference: Step up halfway or down halfway after each test until satisfied.
- Boot Lock-In: Commit the settled size permanently into
/etc/rc.
Out-of-Band Mutual Safeword
Operational authority is guarded by an air-gapped mutual challenge-response safeword between Operator Marc F. Crusan, Agent Zero, and Node 001 over local loopback and serial wire—completely eliminating corporate PKI, expiring third-party certificates, and cloud OAuth dependencies.
Zero Cloud PKI Local Loopback DispatchPublications, Custom Hardware & Product Support
We keep a clear line between what is shipping today and what is currently in bench validation or custom-built by direct inquiry.
- ✓ Shipping Today: Volume-1: The RAID-5 Shelf (Edition 2.a Print & Kindle on Amazon)
- ✓ Shipping Today: Official Amazon Storefront Goods & Printify Studio Apparel
- ✓ Available Today: Open-Source Viewer Suite, Flasher & Companion Tools on GitHub
- ✓ Planned / By Inquiry: Custom Prototype AxisOS™ Hardware Kits & RP2350 Micro-Nodes
- ✓ In Preparation: Command Reference Manual, Complete Works & Print Comic Editions
- ✓ Direct Dispatch: Email Product Support & Select Systems Advisory (Business Hours)
AxisOS™ in Motion
Independent systems powered by Crusan & Co. engineering and our flagship product, AxisOS™—operating locally across homes, shops, and micro-enterprises.
Built for Real-World Operators
Honest · Auditable · Owned
Built on the Oregon Coast
Founded by Marc Crusan, Crusan & Co blends hands-on infrastructure experience with a craftsman’s dedication to quality. We reject unnecessary complexity in favor of pure, auditable, and deterministic engineering.
From custom operating systems running bare-metal on ARM hardware to autonomous agent meshes and field deployment kits, our solutions are built to be robust, understandable, and self-reliant.
Commercial Sales, Custom Inquiries & Product Support
Whether you’re purchasing printed technical books and studio goods shipping today, inquiring about custom prototype AxisOS™ hardware builds, or requesting customer technical support for your Crusan & Co. products.
Commercial Merchant Notice: Crusan & Co. (operated by Marc F. Crusan, Oregon Coast, USA · marc@crusan.net) is a commercial, for-profit engineering studio and retail merchant. All transactions processed on Crusan & Co. commercial storefronts are commercial sales of physical goods, books, software, and product technical support (zero charitable solicitations).