On July 17, Valve and open-source firm Collabora released the first public preview of Holo Core — an AArch64 port of Arch Linux built specifically for the upcoming Steam Frame headset. The package includes precompiled binaries, source definitions, and a ready-to-use development container, delivering the earliest tangible foundation for what will become an Arm-based SteamOS.
A Development Preview, Not a Consumer Release
Holo Core is not a downloadable SteamOS image, a Steam Frame firmware file, or a general-purpose Arm version of Arch Linux. It is a curated set of packages — several thousand, according to Collabora — drawn from a snapshot of Arch Linux dated November 18, 2025, with modifications needed to run on AArch64 processors. The container and source code are intended for developers who want to build, test, and inspect the operating system substrate that will power Valve’s headset.
The preview includes the “base-devel” container required to compile packages in the Arch style, along with the full source dependency chain for Steam Frame development. Because upstream Arch Linux does not officially support the AArch64 architecture, Valve and Collabora had to fork and stabilize a rolling-release distribution while also engineering a build system capable of determining correct dependency graphs as Arch packages evolve.
“We have not rebuilt the entire world,” Collabora’s announcement notes, referring to the tens of thousands of packages in Arch Linux. The initial scope is strictly the subset needed for OS image creation and headset development. Still, even that limited set balloons into thousands of runtime and build dependencies, a scale that makes clear this is far more complex than a simple recompile.
What It Means for Different Audiences
For everyday Windows users and gamers, Holo Core has no immediate, installable payoff. You cannot transform your PC or existing VR hardware into a Steam Frame, nor can you boot this preview as a desktop OS. The announcement is an infrastructure milestone, not a product launch. However, it signals that Valve’s Arm ambitions are moving from rumor to reality, and that the company is investing in a parallel, non-x86 ecosystem that could eventually broaden gaming hardware options.
For developers — especially those maintaining Linux game engines, middleware, graphics drivers, or Steam-related tooling — the container is an actionable starting point. You can run it natively on Arm Linux hardware, or via QEMU user-space emulation on x86-64 Linux machines using Docker, Podman, or Distrobox. Collabora expects emulated builds to be slower, but the environment is functional. The workflow uses standard Arch’s makepkg process, so anyone familiar with that toolchain can begin verifying compatibility and flagging issues.
For IT professionals and tinkerers watching the Arm gaming space, Holo Core is a rare glimpse into the reproducibility and continuous integration (CI) challenges of shipping a rolling-release OS on fixed hardware. The project’s public CI pipeline — which aims to shadow Arch Linux’s evolution without official AArch64 support — could serve as a model for other efforts to bring fast-moving Linux distributions to Arm devices.
The Long Road to an Arm-Based SteamOS
Valve’s current SteamOS, best known from the Steam Deck handheld, is a snapshot of Arch Linux augmented with proprietary patches for gaming performance and compatibility. The x86-64 architecture is a known quantity; thousands of games have been validated against that environment. For Steam Frame, Valve is betting on a 64-bit Arm processor — the exact chip has not been disclosed — which forces a clean-sheet port of the entire operating system layer.
The fundamental difficulty is that Arch Linux, as a community distribution, does not provide official AArch64 repositories or build infrastructure. Valve could have chosen a distribution like Debian or Fedora that already supports AArch64, but the company has deep institutional investment in Arch. Staying with Arch means adopting a rolling-release cadence where package versions, signatures, and dependency relationships change daily. Collabora’s engineering team therefore had to freeze a known-good snapshot (November 2025) and reverse-engineer a build order that guarantees consistent output, while also designing a CI system that can keep up with future Arch updates.
That CI work may ultimately be Holo Core’s most lasting contribution. If the team can automate the regeneration of an Arm package set from a moving upstream, it will have solved much of the maintenance burden that plagues hardware-specific Arch forks. Collabora has expressed hope of feeding this work back to the upstream Arch Linux project, though no integration plan has been formalized.
There is also a striking parallel with Windows on Arm. Microsoft’s multi-year effort to bring native Arm64 support to Windows, along with a maturing emulation layer for x86-64 apps, offers a roadmap for what Valve faces in gaming. Most Windows games are compiled for x86-64; even Linux-native titles often assume x86. Valve will need a stack of translation layers — likely involving Proton, SteamVR, and vendor-specific graphics drivers — all running reliably on an Arm Linux base. Holo Core is only the OS substrate, but without it, none of that higher-level compatibility work can begin in earnest.
What You Can Do Right Now
If you are a developer with a genuine need to test against the Steam Frame’s eventual OS environment, head to Collabora’s Holo Core page. The preview provides a downloadable container image and instructions for importing the necessary package-signing keys. The canonical test is to run a native build inside the container, for example using makepkg on one of the supplied source packages. If you lack Arm hardware, the container can be launched under QEMU user emulation, though you should budget for significantly longer build times.
For everyone else, the practical step is to watch the public package repositories and issue trackers that Collabora and Valve are populating. Early developer feedback will help shape the final product, and the quality of the build infrastructure will determine how quickly Valve can iterate between Arch’s upstream changes and the fixed hardware inside the Steam Frame.
Valve has not published a timeline for consumer availability, and this preview does not change that. But the existence of inspectable code, a CI pipeline, and a visible build chain makes it possible for the wider community to validate progress instead of waiting for a closed-door reveal.
What to Watch Next
The next milestone for Holo Core is staying current: proving that the CI system can incorporate Arch Linux’s continuous updates without breaking the dependency graph. If successful, the project will gradually expand its package set to include more of the libraries and services needed for a full headset experience — display compositing, audio, input handling, and the complex integration with SteamVR.
Meanwhile, the SteamVR interface itself recently received a major overhaul, as noted by GamingOnLinux, which further suggests that Valve is aligning its software stack for a new form factor. When Steam Frame does launch, the end user will see a polished headset; beneath that surface will be thousands of Arm-compiled packages and a CI pipeline that Holo Core is stress-testing today.