Developing for U-Boot often involves chasing down elusive memory leaks and waiting for long test suites to finish. A recent series of 29 patches is aimed squarely at improving the developer experience in these areas. This series introduces powerful new malloc debugging tools, optimises the video subsystem, and significantly improves the performance of the test/py…
The effort to modernise U-Boot’s filesystem support continues with a major update to ext4l—the new ext4 driver ported directly from Linux. A recent series series of 30 patches that brings full write capabilities to the driver. So far ext4l has only supported reading. With this series, the driver now supports the full lifecycle of file…
Developing for U-Boot often involves juggling a variety of tools: buildman for compilation, patman for patch submission, test.py for integration testing, and git for version control. While these tools are powerful individually, orchestrating them—especially when dealing with complex CI pipelines and dependencies—can be tedious. To bridge these gaps, we are introducing uman (U-Boot Manager), a…
Testing is the backbone of U-Boot development, but as the test suite grows, so does the friction involved in running it. Whether it is the time it takes to regenerate disk images or the difficulty of parsing test output in CI, there is always room for improvement. A recent series of 9 patches in Concept…
Automating cherry-picks with AI (as seen in our introduction to pickman) was a huge step forward for U-Boot Concept maintenance. However, as any maintainer knows, theory and practice often collide when you try to apply 260+ commits in a single session. After several weeks of real-world use, we’ve identified three “stress points” in large-scale cherry-picking:…
If you have ever run make htmldocs in U-Boot, you are likely familiar with the “wall of text” it produces. Between the standard Sphinx output, sub-make messages, and custom progress indicators, the build process has traditionally been very noisy. While verbose output can be useful for debugging the toolchain itself, it is a hindrance when…
In the world of bootloaders, balance is everything. We need enough functionality to load an OS, but we must keep the footprint small and the code maintainable. For years, U-Boot has relied on a custom implementation of the EXT4 filesystem. However, as the EXT4 format evolves with features like metadata checksums and fast commits, keeping…
Managing cherry-picks across multiple branches is one of the more tedious aspects of maintaining a large project like U-Boot. When you need to backport dozens of commits from an upstream branch while handling merge commits, resolving conflicts, and creating merge requests, the process can consume hours of developer time. Today we’re introducing pickman, a new tool…
U-Boot has two testing worlds that rarely meet. Python tests are flexible and can set up complex scenarios – disk images, network configurations, boot environments. C tests are fast, debuggable, and run directly on hardware. What if we could combine them? The Problem Consider filesystem testing. You need to: The Python test framework handles steps…
Have you ever seen output like this from your test suite? That’s not a buffer overflow or memory corruption. It’s a wierd interaction between linker alignment, compiler optimisations, and pointer arithmetic. Let me tell you how we tracked it down. The Mystery U-Boot uses ‘linker lists’ extensively – a pattern where the linker collects scattered…
