Current Software Specifications
Software Stack: From First Boot to Full Distribution
Note: This is an initial draft of the software roadmap for the PowerPC Notebook project. At this stage, this is more of brain dump, rather than a polished roadmap. Contributions and comments are welcome.
Target architecture: PPC64 Big Endian.
Introduction
The software stack for the PowerPC Notebook is a critical enabler for the hardware. Our challenge is to bring up a modern, open-source Linux system on non-mainstream architecture (PowerPC), using a custom motherboard based on the NXP T2080 (?) SoC. That means:
- Bootstrapping software from scratch, with limited upstream support
- Building and testing a minimal Linux system to prove hardware works
- Gradually evolving toward a user-friendly, maintainable Linux distribution
We outline a progressive roadmap: from booting the board to building our own distro, using modern infrastructure and tools wherever possible.
1. Basic Plan: Booting the First Prototype
The first goal is to ensure our hardware can boot into a minimal Linux environment.
What Needs to Be Done
| Task | Description |
|---|---|
| Set up cross toolchain | Use NXP’s PowerPC GCC SDK for T2080 |
| Build U-Boot | Start from T2080RDB_defconfig, customize for our board
|
| Write Device Tree (DTS) | Tailor the .dts to our motherboard’s peripherals |
| Build kernel | Use NXP's patched or mainline kernel with minimal config |
| Load root filesystem | Use Initramfs, NFS, SD card or TFTP |
| Test via serial console | Use UART for logs and early debugging |
Why
- Validates CPU, memory, and power circuitry
- Enables testing and debugging of other peripherals
- Serves as foundation for OS bring-up and userland development
2. Essentials: Proving the Prototype Works
Once we can boot, we need a minimal userland to interact with the system.
Components Required
| Component | Functionality |
|---|---|
| U-Boot | Initialize CPU, memory, load kernel |
| Linux kernel | Hardware detection and device drivers |
| Root filesystem | BusyBox or minimal Debian NFS root |
| Serial console | Primary I/O for early interaction |
| Storage access | SD, SATA, or USB (at least one working path) |
| Device tree blob | Custom for motherboard |
Goal
- Boot into a shell prompt
- Validate basic system resources (
/proc/cpuinfo,dmesg, etc.) - Confirm networking, storage, and peripheral availability
3. Nice-to-Haves: Editors, Tools, and Utilities
Once the system is up, we add tools to support development, testing, and usability.
Suggested Additions
| Category | Tools |
|---|---|
| Editors | nano, vim |
| Networking | curl, wget, ping, ssh |
| Debugging | gdb, strace, perf, valgrind |
| System info | htop, lshw, i2c-tools, lsusb |
| Disk tools | fdisk, parted, e2fsprogs, btrfs-progs |
| Package management | apt, dpkg, or apk (depending on base) |
4. Distro: Building Our Own PowerPC Linux Distribution
Eventually, we want a user-facing Linux distribution specifically optimized for the PowerPC Notebook.
Building Blocks
| Component | Details |
|---|---|
| Base System | Debian PPC64, Gentoo, or Void PPC |
| Kernel | Custom-built with PowerPC Notebook config |
| Init system | systemd or OpenRC |
| Package management | apt (Debian), emerge (Gentoo), xbps (Void) |
| Desktop environment | XFCE, MATE, GNOME (PPC64 builds) |
| Installer | CLI or graphical installer image |
| Update system | apt repos or rsync-based delta updates |
| Branding | Custom themes, logos, powerpcnotebook.org |
Distro Build Systems to Consider
- debootstrap / live-build (Debian-based builds)
- Buildroot (for minimal rootfs + kernel images)
- Yocto Project (flexible meta-distribution)
- Gentoo Catalyst (for full ISO or stage builds)
5. CI/CD Pipelines and Build Infrastructure
To ensure maintainability, reproducibility, and collaboration, we aim to adopt continuous integration and modern DevOps practices.
CI/CD Goals
- Automatically build U-Boot, kernel, and rootfs images
- Run tests on emulated environments (QEMU PPC64)
- Deploy daily/weekly builds for community testing
- Detect regressions early and validate commits
Tools
| Use Case | Toolchain |
|---|---|
| CI/CD pipelines | GitHub Actions, GitLab CI, Buildbot |
| Emulated testing | QEMU PowerPC64 + expect/serial scripts |
| Cross-builds | Docker + powerpc64-linux-gnu-gcc toolchains
|
| Image hosting | GitHub Pages, Netlify, custom CDN |
| Build orchestration | cbuild, Yocto Autobuilder, Jenkins |
Example CI Flow
- Push to
mainbranch - GitHub Actions builds U-Boot, kernel, and rootfs
- QEMU boots the image and verifies UART output
- Artifacts are uploaded to
artifacts.powerpcnotebook.org
6. Docker Images for Build and Dev Environments
Pre-configured Docker images help developers build and test quickly across any host system.
Use Cases
- Build U-Boot or Linux kernel from any host
- Package testing in isolated environments
- Running PPC-specific tools in reproducible containers
Example Images
| Image Name | Description |
|---|---|
| powerpc-dev-env | Full dev env with toolchain and make |
| powerpc-kernel-builder | Kernel-specific builder and configs |
| powerpc-debian-chroot | Debootstrap PPC64 rootfs for package test |
7. Inspirations from Debian and Other Projects
We aim to reuse and adapt ideas from existing projects to accelerate development.
Relevant Debian Practices
- Reproducible Builds
- Debian Ports infrastructure
live-buildanddebootstrap- Debian Installer (
d-i) - QA tools: lintian, piuparts, autopkgtest
Related Projects to Watch
| Project | Relevance |
|---|---|
| Debian PowerPC | Maintains PPC64 ports and packages |
| Void PPC | Maintains lightweight PPC builds |
| Gentoo PPC | Flexible, source-based PPC support |
| Yocto/OpenEmbedded | Board support packages and rootfs config |
| OpenPOWER Firmware | Future firmware replacement roadmap |
8. Build Tooling (WIP/Placeholders)
This section will document the exact steps, tools, and workflows needed to build every part of the software stack.
Build Tooling Overview
- Cross-toolchain setup (e.g. NXP SDK, crosstool-ng, LLVM)
- U-Boot build and customization
- Linux kernel configuration and build
- Root filesystem generation methods (debootstrap, Buildroot, Yocto)
- Build orchestration (Makefiles, shell scripts, CI runners)
- Packaging tools for our distro (dpkg, xbps, etc.)
- Secure image signing (U-Boot SPL, FIT images, secure boot)
- Emulator-based validation and test harnesses
Note: Details for each item will be populated progressively as we finalize architecture and test results.