Current Software Specifications

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Software Stack: From First Boot to Full Distribution

Note: This is an initial draft of the software roadmap for the PowerPC Notebook project. This should be treated as high level thinking for now to give us a starting point rather than as a finalized roadmap. Comments and contributions 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

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 ===

Goal

  • Boot into a shell prompt
  • Validate basic system resources (<code>/proc/cpuinfo</code>, <code>dmesg</code>, 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 ===

4. Distro: Building Our Own PowerPC Linux Distribution

Eventually, we want a user-facing Linux distribution specifically optimized for the PowerPC Notebook.

=== Building Blocks ===

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. Reusing and Cross-compiling from Existing Distros

Before reinventing the wheel, we aim to reuse as much as possible from other PowerPC-supporting Linux distributions.

=== Sources of Reusable Packages ===
* Debian Ports: Many packages already built for PPC64 (Big Endian)  
* Gentoo PPC64: Source-based packages easily recompiled for our target  
* Void Linux PPC: Lightweight, musl or glibc-based  
* Buildroot: Embedded-focused, ideal for minimal images  
* Yocto layers/meta-ppc: Helpful BSPs and tooling  

Cross-compiling Approach

1. Use `powerpc64-linux-gnu-gcc` cross-toolchain  
2. Cross-compile Debian source packages or Gentoo ebuilds  
3. Create our own package repository (e.g., Debian-style repo or overlay FS)  
4. Validate on QEMU before deploying to real hardware  

=== Tools and Infrastructure ===

Goal: Reduce duplication, benefit from upstream security updates, and create a lean maintainable software stack.

6. 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

7. 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

8. 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
  • <code>live-build</code> and <code>debootstrap</code>  
  • Debian Installer (<code>d-i</code>)  
  • QA tools: lintian, piuparts, autopkgtest  

=== Related Projects to Watch ===
{| class="wikitable"
! 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
|}

9. 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.

Technical Resources

Community and Support


* Power Progress Community  
* PowerPC IRC/Matrix  
* OpenPOWER Foundation  













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