Android 17 on a 4.9 Kernel: LineageOS 24.0 on the Pixel 3a

6.9 relevance

Deep technical dive into Android kernel and LineageOS, relevant for platform engineering.

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Why It Matters

For platform engineers and open-source maintainers, this demonstrates the extreme limits of kernel backporting and the growing gap between Android's kernel requirements and older hardware, offering a blueprint for extending device lifespan through custom ROMs.

Key Takeaways

Evaluate your CI/CD pipeline's ability to handle kernel backports and platform code forks when targeting older hardware with modern Android releases.

Android 17 on a 4.9 Kernel: LineageOS 24.0 on the Pixel 3a

Summary

A developer successfully booted LineageOS 24.0 (Android 17) on a Pixel 3a using its original 4.9 Linux kernel, despite Android 17 assuming at least kernel 5.10. The port required one kernel fix for a cgroup BPF reference count, five platform code forks (fscrypt keys, BPF loader, netd/Connectivity, native app zygote), and device-tree changes for ueventd, gralloc, and ION memory allocator. The phone boots in 83 seconds with SELinux enforcing, Wi-Fi, Bluetooth, sensors, Chrome, and Google Play Services working, while preserving user data across updates.

Author

xbill