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The reliable path is to use a current Ubuntu LTS host (or a Linux virtual machine), install the packages required by OpenBMC and Yocto, clone the OpenBMC source tree, source setup for a supported machine, and build with BitBake. For a first build without a physical BMC, use the Romulus target and its documented QEMU flow. A full image build needs substantial disk and memory, and every build is tied to the hardware target selected during setup.
What an OpenBMC development environment contains
OpenBMC is a Linux distribution for baseboard management controllers (BMCs). You do not compile one universal image: Yocto and BitBake assemble a target-specific firmware image from layers, recipes, configuration, and machine settings. The environment therefore has four parts:
- A supported Linux host: the official beginner tutorial recommends the latest Ubuntu LTS release for its development virtual machine. A direct Linux installation can also work.
- Build dependencies: compilers, Git, archive tools, patch utilities, and other packages required by OpenBMC and Yocto.
- The OpenBMC source tree: this contains the
setupscript, metadata layers, recipes, and configuration. - A selected machine: sourcing
setupfor a machine configures the environment for that board or emulator before BitBake runs.
If you omit the machine selection, the build is not properly configured. The same host can build different targets, but you must source the setup script for the intended target before each independent build environment.
The Tool Desk
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The official tutorial is written for programmers who are comfortable with Linux and BMC concepts. Ubuntu is the least-surprising starting point because it is the environment the tutorial recommends and the community uses most often. Other distributions may work, but they are less thoroughly exercised by the core team.
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| Host option | Best fit | What to know |
|---|---|---|
| Ubuntu LTS directly on hardware | Frequent OpenBMC development and maximum build performance | Closest to the documented path; no virtual-machine overhead. |
| Ubuntu LTS in a virtual machine | Windows or macOS users, isolated development, or a host that cannot be repartitioned | The tutorial names VirtualBox and VMware Workstation Player as possible VM software. Allocate the build resources before starting. |
| Fedora directly on hardware or in a VM | Developers who already standardize on Fedora | The repository documents a Fedora package list, but package names and current Yocto requirements can change. |
| Docker | Reproducible or continuous-integration workflows | OpenBMC uses Docker in CI, but the beginner development tutorial places Docker outside its scope. Expect to manage mounts, permissions, and persistent build storage yourself. |
Windows and macOS are not the native build environments described by the tutorial. Run a supported Linux distribution in a VM instead of trying to make BitBake run directly on the host operating system.
Plan CPU, memory, and storage before installing
For a VM building a complete OpenBMC image, the official development tutorial describes an ideal minimum allocation of eight threads, 16 GB of memory, and a 200 GB virtual hard drive. “Ideal minimum” is planning guidance, not a guarantee for every machine, target, host filesystem, or current source revision. More CPU, memory, and fast storage generally improve responsiveness and reduce contention with the host.
| Resource | Tutorial guidance | Why it matters |
|---|---|---|
| CPU | 8 threads | BitBake runs many tasks concurrently; too few threads lengthen builds and can make a VM feel unresponsive. |
| Memory | 16 GB | Parallel compilation and packaging can consume substantial RAM. Leave enough memory for the host OS if using a VM. |
| Disk | 200 GB | Source, downloaded archives, shared state, temporary files, and deployed images all accumulate under the build workspace. |
| Romulus build time | 30–120 minutes in the tutorial’s example | This is the tutorial’s hardware-dependent estimate, not a universal completion promise or benchmark. |
Check available capacity before cloning or building. A nearly full filesystem can fail late, after hours of compilation. In a VM, make the virtual disk large enough from the beginning or confirm that your hypervisor supports safe expansion. Keep the build directory on local, fast storage rather than a slow network share when possible.
Install the host prerequisites
The OpenBMC repository README lists the following packages. Yocto’s requirements evolve, so compare the current Yocto requirements with these lists when you create or refresh a host. Distribution package names can differ by release.
Ubuntu
On Ubuntu, refresh package metadata and install the documented prerequisites:
sudo apt update
sudo apt install git gcc g++ make file wget gawk diffstat bzip2 cpio chrpath zstd lz4The command installs Git, the C and C++ toolchains, build utilities, archive/compression tools, and the text-processing and packaging programs used during a BitBake build. If apt reports that a package name is unavailable, do not substitute a random similarly named package; check the current OpenBMC README and Yocto requirement for your Ubuntu release.
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Fedora
The README’s Fedora list is:
sudo dnf install git python3 gcc g++ gawk which bzip2 chrpath cpio hostname file diffutils diffstat lz4 wget zstd rpcgen patchFedora’s package set includes Python 3, hostname utilities, RPC tooling, and patch support explicitly. A minimal Fedora installation may need additional runtime libraries or development tools as Yocto changes, so treat the README and current Yocto documentation as the authority for a newly released Fedora version.
Verify the basics
- Run
git --version,gcc --version, andpython3 --version(where Python 3 is installed) to confirm that the commands resolve. - Run
df -hin the filesystem that will hold the source and build directories; confirm that the planned workspace has room for a large build. - For a VM, confirm that the guest sees the intended number of CPU threads and memory rather than only the host’s totals.
- Use a normal, non-root account for the source tree and BitBake. Running the build as root can create ownership problems and is not a substitute for missing dependencies.
Clone OpenBMC and inspect supported machines
Clone the upstream repository and enter its root directory:
git clone https://github.com/openbmc/openbmc
cd openbmcThe OpenBMC repository changes over time, so record the revision you use if you need to reproduce a build. The root directory is important: the setup script and the build configuration it creates are expected to be invoked there.
Run the setup script without a machine argument to display the supported hardware targets:
. setupThe leading dot (equivalent to source) matters. Sourcing changes environment variables in your current shell; executing the script as a separate process would not leave those settings available for the following BitBake command.
Choose a machine from the list. A target name is not interchangeable with a product name: it selects machine configuration, layers, kernel choices, device-tree data, and image settings. If you have a physical board, use the machine documented for that board. If you are learning or do not yet have hardware, use romulus, the target used by the official tutorial’s QEMU path.
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Configure a target with setup
From the repository root, source the setup script with the selected machine. For the documented emulator example:
. setup romulusThis creates or selects the target’s build directory and exports the environment BitBake needs. A different target follows the same form, replacing romulus with the supported machine name shown by . setup.
- Source setup again whenever you open a new shell for this build.
- Do not assume that a previous target remains active after changing directories or starting a new terminal.
- Keep separate build directories or cleanly reconfigure when working on multiple machines; mixing configuration from different targets can produce confusing results.
If setup reports an unknown target, return to . setup with no argument and select a name from the current list instead of guessing a spelling.
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Build the OpenBMC image with BitBake
After sourcing the target, start the standard OpenBMC image build:
bitbake obmc-phosphor-imageBitBake resolves recipes and dependencies, downloads source archives, compiles packages, assembles the root filesystem, and writes deployable artifacts. The first build is the expensive one because downloads and shared state are not yet cached. Later builds can be much shorter when you change only a small component, although the exact work depends on what changed.
For the Romulus example, the tutorial describes output under:
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build/tmp/deploy/images/romulus/File names and formats in that directory depend on the target and the current metadata. List the directory after a successful build rather than assuming that an image from one machine can boot another:
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find build/tmp/deploy/images/romulus -maxdepth 1 -type f -printThe tutorial’s 30–120 minute estimate applies to its Romulus example and varies with CPU, storage, memory, network downloads, and cache state. A build that appears idle may be waiting on a download or a single long-running task; inspect the BitBake output before interrupting it.
Run the Romulus image in QEMU
QEMU lets you exercise the built image without a physical BMC. Romulus is the tutorial’s default test system and is described there as the system tested for each CI job, making it the most stable example for learning the workflow. QEMU is a development and smoke-test aid, not proof that the image works on your actual board, sensors, buses, or boot firmware.
- Complete
bitbake obmc-phosphor-imageafter sourcing. setup romulus. - Confirm that deployable files exist in
build/tmp/deploy/images/romulus/. - Use the current Romulus QEMU invocation from the OpenBMC development tutorial. Its kernel, machine, image, and networking arguments are tied to that documented flow and can change as the project evolves; do not substitute a generic QEMU command copied from another target.
- Wait for the emulated BMC to finish booting, then query its state from the shell provided by the tutorial.
- Run
obmcutil staterepeatedly until the BMC reportsReady. If it never reaches that state, preserve the QEMU and service logs before changing configuration.
Networking details are target- and invocation-specific. A QEMU guest that boots successfully may still need the documented port forwarding or interface settings before you can reach its web or management services from the host.
Move from full-image builds to component development
A complete image build is the right first milestone because it proves that the host, layers, machine configuration, and toolchain work together. It is not the most efficient loop for every application change. OpenBMC’s developer documentation points from environment setup to a devtool Hello World tutorial, Web UI development, and Gerrit code review.
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After sourcing the target with . setup <machine>, the Yocto devtool command can extract a recipe’s source into the local BitBake workspace:
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devtool modify <recipe-name>Replace <recipe-name> with the recipe you intend to change; identify the exact recipe name from the layer metadata or the Hello World tutorial rather than guessing. Edit the extracted source in the workspace, then build the component through the devtool workflow. This keeps iterative application work separate from the initial task of proving that a full target image can be produced.
Know when to return to a full image build
- Build the full
obmc-phosphor-imagewhen you need a deployable firmware image or have changed machine, image, kernel, or layer configuration. - Use the component workflow for focused source edits where the target configuration is unchanged.
- Before submitting a change, follow the project’s current developer and review guidance; a component that builds in isolation can still fail when integrated into the complete image.
Troubleshoot the failures most likely to block a first build
BitBake reports PermissionError for /proc/self/uid_map on Ubuntu 24.04
The development tutorial warns that Ubuntu 24.04’s default restriction of unprivileged user namespaces under AppArmor can cause BitBake workers to fail while writing to /proc/self/uid_map. This is a host security-policy issue, not evidence that the recipe itself is broken.
Use the sysctl workaround documented in the current OpenBMC development-environment instructions, then retry the build. Apply it narrowly and understand that it changes a system-level security setting; do not generalize the workaround to every Ubuntu release or distribution, and do not disable unrelated security controls. If your organization manages AppArmor or sysctl policy centrally, ask the administrator for an approved equivalent.
The package manager cannot find a prerequisite
Package names vary between distribution releases. First check that the package index is current, then compare the missing item with the current OpenBMC README and Yocto requirements. Avoid copying a package name from an older tutorial without checking its release context. A successful install of a similarly named package does not prove that it supplies the required command.
The build stops with “no target” or an unknown machine
Run . setup from the repository root and select one of the machines it prints. Source the selected target again in the same terminal, then rerun BitBake. A machine name from another OpenBMC branch or product may not exist in the revision you cloned.
The build runs out of disk space
Check the filesystem containing the source and build directories with df -h. Downloads, temporary task data, shared state, and deploy artifacts can all grow during the first build. Free space or move the workspace to a larger local disk before restarting. The tutorial’s 200 GB VM allocation is a planning reference, not a statement that every target consumes exactly that amount.
QEMU starts but the BMC is not ready
Confirm that the image was built for Romulus, that you used the current Romulus invocation, and that the guest has finished booting. Check the console output and service logs supplied by that flow. Run obmcutil state only after the guest is reachable; a host-side networking problem can look like a boot failure even when the guest is still running.
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QEMU validates the software image and basic services for the emulated target. It does not model every board-specific sensor, GPIO, power controller, flash layout, network switch, or bootloader detail. For hardware work, source the setup script for the board’s supported machine, build that target, and test on the actual platform using its flashing and recovery procedure.
Quick Recap
Pick an environment by development objective
| Objective | Recommended starting point | Next action |
|---|---|---|
| Learn OpenBMC without hardware | Ubuntu LTS VM with the tutorial’s ideal resource allocation | Build Romulus and boot it in QEMU; wait for obmcutil state to report Ready. |
| Build firmware for a supported board | Ubuntu LTS directly or in a VM, with storage reserved for repeated builds | Run . setup, select the board’s machine, then build obmc-phosphor-image. |
| Iterate on one application | An already working target environment | Source the target and use devtool modify for the component-level loop. |
| Match an existing Fedora-based team | Fedora with the README’s prerequisite set | Validate the current Yocto requirements before starting a long build. |
| Reproduce CI-style builds | Containerized workflow only if you already manage Docker build infrastructure | Persist downloads and build caches, and handle user IDs and permissions explicitly; this is outside the beginner tutorial. |
A repeatable first-day checklist
- Choose Ubuntu LTS unless you have a specific reason to use another supported Linux distribution.
- Allocate approximately eight threads, 16 GB RAM, and 200 GB disk for a full-image VM, remembering that these are ideal planning figures.
- Install the documented packages for your distribution and compare them with current Yocto requirements.
- Clone
https://github.com/openbmc/openbmcand work from its root directory. - Run
. setupto see supported machines. - Source
. setup romulusfor the tutorial’s emulator path, or source the machine that matches your physical board. - Run
bitbake obmc-phosphor-imageand monitor disk space while the first build completes. - For Romulus, inspect
build/tmp/deploy/images/romulus/and use the current documented QEMU command. - Run
obmcutil stateuntil the emulated BMC reportsReady. - Once the full image works, move focused application changes to the
devtoolworkflow and use the project’s current review guidance for submissions.
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