tinyboot

tiny secure bootloader project for embedded system written in Rust
Assumed to be used for research purposes
Now targeting only RISC-V processor

✨ Features

Some are in the conceptual stage now.

• Multi architecture
• Simple SecureBoot Implementation
• Minimal hardware abstraction layer / driver
• Small footprint (ideally)
• cargo-make based Kconfig like build-system
• High extensibility

🎨 Project Structure

This project consists of the following components

• libtinyboot
  • core library of the tinyboot security logic
• loader
  • main source of the bootloader
  • separated by each target
• arch
  • architecture specific components (e.g. asm source)
• board
  • target board specific components (e.g. hal, drivers)

🛠️ Building

Pre-requisites

• Rust (>= 1.60)
  • Must install required target (e.g. riscv64imac-unknown-none-elf)
• Cargo
• cargo-make
  • For details: https://github.com/sagiegurari/cargo-make

Build bootloader

This is the example of building for RISC-V QEMU virt target (riscv64)

# Configure build target
cargo make defconfig virt-riscv64
# Build
cargo make build

In this example, two artifacts are generated in loader/virt-riscv64

• tinyboot-fw.bin
  • firmware loader
  • same functionality as FSBL, U-Boot SPL
• tinyboot.bin
  • OS loader
  • same functionality as U-Boot Proper

Build system

🚧 WIP

Adding new target

🚧 WIP

🗺️ Roadmap

• Project structure
• Create prototype build-system
• Emulation target (virt-riscv64)
  • Implement minimum hal / SBI interface
  • Implement simple loader
  • Implement core security logic
• Porting to real hardware target (HiFive Unmatched or VisionFive ...?)
• ...

✏️ Author

• Akihiro Saiki - Main worker - Nanamiiiii

©️ License

This project is licensed under the Apache 2.0 License - see the LICENSE for details