Arc — Redpill loader for DSM 7.x

A DSM 7.x loader for x86-64 with guided setup, wide hardware support and addons.
Configure it on the machine's screen or from your browser.

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Important

• Arc and DSM are independent from each other — Arc is a boot helper for DSM.
• Commercial use is not permitted and strictly forbidden.
• DSM and all parts of it are under copyright / ownership by Synology Inc.
• Arc is based on full DSM, not vDSM.
• The loader is free and will stay free forever. If you paid a suspicious person for it, I can't help you — I'm not connected to them.

Warning

Any user-specific modification of the tested and prebuilt loader images can cause irreversible data loss. Back up anything on the machine's disks first. The project is released for educational and learning purposes only, and I'm not liable for damage or loss of any kind.

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✨ What Arc does

Arc turns an x86-64 PC, server or VM into a DSM 7.x machine. You write it to a disk, boot from it, and configure it in the menu — on the machine's screen, or at http://<loader-ip>:7080 in a browser.

• Guided setup — Choose Model → Build Loader → Boot Loader, with DSM version, addons and modules picked for you and changeable before the build
• Wide hardware support — 4.4 and 5.10 based platforms, drivers for many controllers and NICs, SATA PortMap and DTS map options for the disk layout
• Custom kernels — on the 5.10 platforms with DSM 7.3 and later, choose between Synology's stock kernel and arc-custom's kernels with hybrid CPU and wider hardware support
• Arc Patch — a serial and MACs for the chosen model, with AME, QuickConnect and more; or bring your own, or use random ones
• Addons and modules — select addons (stable and beta) and kernel modules per build
• Hardware options — NIC order, fan control, CPU scaling governor, GPU passthrough (IOMMU), USB disks as internal, eMMC and SATA DOM boot
• DSM options — edit cmdline and synoinfo, add a user or change a password, allow a DSM downgrade, reset the network config, force-enable SSH, clear blocked IPs and the update cache
• Web tools — the web config at :7080 with a terminal and a file manager, for machines without a screen
• Loader tools — backup, restore and recovery, static IP, loader password and ports, clone the loader to another disk, Format Disks, offline mode
• Updates itself — from the GitHub release, latest or beta, or from an update file

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🧭 How it works

GRUB → Arc (Buildroot) → menu on screen, web config on :7080
                       └─ Build Loader: DSM boot files → kernel (stock or arc-custom)
                          → ramdisk patched → addons and modules added
        Boot Loader:  Arc → kexec → DSM 7.x → DSM's own installer

Two systems, two jobs: Arc prepares DSM, and DSM runs your NAS. Arc builds a loader for the model you chose, then starts DSM on it — so DSM sees the Synology it expects, on your own hardware.

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🖥️ Supported

Platform	Kernel	DSM	Custom kernel
apollolake, broadwell, broadwellnk, broadwellnkv2, broadwellntbap, denverton, geminilake, purley, r1000, v1000	4.4.302	7.2, 7.3, 7.4	—
epyc7002	5.10.55	7.2, 7.3, 7.4	7.2, 7.3, 7.4
geminilakenk, r1000nk, v1000nk	5.10.55	7.2, 7.3, 7.4	7.3, 7.4
epyc7003, icelaked	5.10.55	7.4	7.4
epyc7003ntb	5.10.55	7.4	—

The platforms and models come from arc-configs; the menu shows which models fit the machine.

A custom kernel replaces Synology's stock kernel: legacy adds hybrid CPU and wider hardware support, and runs under Hyper-V. Pick it under Kernel in the menu when it is shipped for your version.

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📋 What you need

• An x86-64 machine or VM you own
• A disk for the loader, 4 GB or more — a USB stick, or a SATA disk in a VM
• At least one disk for DSM
• A wired network
• Internet while building, to fetch DSM's boot files

Arc also runs in Docker, through a QEMU VM — see docker.md.

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⬆️ Updates

Arc updates itself. Under Update, Update Loader replaces the loader's files in place and keeps your configuration; Upgrade Loader reflashes it. Both fetch the latest release or the beta, together with addons, modules, configs, patches and kernels. Update Dependencies fetches only those.

No internet on the machine? Arc can also update offline from an update file from the releases.

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📚 Documentation

• Documentation — read this first

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🧰 More from the Arc Project

Project	Description
Arc Loader Beta	Beta releases of Arc
Arc Loader Custom	Loader with automated installation
arx	The evolution of Arc — set up entirely from your browser
Arc Control	DSM app for loader settings, monitoring and hardware tuning
Arc Utilities	Tools to install, patch and activate DSM apps on Xpenology
AuxXxilium	Everything else from the Arc Project

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Developer

• AuxXxilium
• Fulcrum

Thanks

• TTG and everyone who continued the original redpill-load project, which the redpill module is based on
• pocopico, jumkey, fbelavenuto, wjz304, PeterSuh-Q3 and others, whose code and work are part of Arc and its addons