Rust (and Slint) on a Jailbroken Kindle

TL;DR

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A developer jailbroke a Kindle Paperwhite and successfully ported Rust and the Slint GUI library to it. This allows for custom applications and interfaces on the e-ink device, demonstrating potential for open-source projects on e-readers.

A developer has successfully run Rust and the Slint GUI library on a jailbroken Kindle Paperwhite, enabling custom applications and interfaces on the device. This achievement demonstrates the potential for open-source development on e-ink devices, which are typically locked down by manufacturers.

The developer, Pete Cordell, jailbroke his Kindle Paperwhite and used cross-compilation tools such as cargo-zigbuild with the Zig compiler to build Rust applications targeting the ARMv7 architecture of the Kindle. He then established SSH access via USBNetwork, allowing him to transfer and run compiled binaries on the device.

Using Rust, he created a simple application and verified it displayed correctly over SSH. He then focused on porting the Slint GUI library, which supports lightweight rendering suitable for e-ink screens. By implementing a custom framebuffer output and using Linux’s ioctl() for display refresh, he managed to display visual output on the Kindle’s e-ink screen. Additionally, he configured the touch input, reading from /dev/input/event1, to handle multi-touch events using the Linux kernel’s multi-touch protocol.

After extensive debugging, he confirmed that both visual output and touch input worked, at least on his specific Kindle model. He packaged the code into a crate and published it on crates.io, making it available for others interested in similar projects.

Why It Matters

This development matters because it demonstrates that open-source software like Rust and Slint can run on proprietary e-reader hardware, potentially enabling a new range of custom applications, interfaces, and enhancements for devices like Kindles. It also highlights the broader trend of hacking and repurposing consumer electronics for personalized use, challenging manufacturer restrictions.

Background

Kindles are typically locked down by Amazon, limiting user modifications. Previous efforts have focused on jailbreaking devices for reading custom content or removing DRM. This project builds on those efforts by showing that even complex GUIs and programming languages like Rust can be ported onto these devices, opening doors for more advanced customization and development.

The use of cross-compilation tools like cargo-zigbuild and the adaptation of Linux device interfaces for display and input management are key technical milestones. While similar projects have been attempted on other low-power devices, applying this to a Kindle, with its specific hardware and software constraints, marks a notable achievement.

“Getting Rust and Slint to run on the Kindle was a matter of cross-compiling, setting up device interfaces, and debugging the display and touch input. It works on my device, and I published the code for others to try.”

— Pete Cordell

What Remains Unclear

It is not yet clear how well this setup will perform across different Kindle models or firmware versions. Compatibility, stability, and usability on other devices remain untested. Further development may be needed to optimize performance and user experience.

What’s Next

Next steps include refining the port for broader Kindle models, developing more complex applications, and possibly creating a user-friendly framework for others to build custom interfaces on e-ink devices. Community involvement could accelerate these efforts.

Key Questions

Can I run Rust and Slint on my Kindle?

Only if your Kindle is jailbroken and you are comfortable with cross-compilation and Linux device management. The project is currently tailored to specific models and requires technical expertise.

Will this damage my Kindle or void my warranty?

Jailbreaking may void your warranty and carries risks of bricking your device. Proceed only if you understand these risks and are willing to accept them.

Is this project open-source?

Yes, the code has been published on crates.io, and the developer encourages others to experiment and contribute.

What can I do with Rust and Slint on a Kindle?

Potential applications include custom dashboards, utilities, or simple games that leverage the device’s e-ink display and touch input.

Source: Hacker News