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RISC-V Open Source Supervisor Binary Interface (OpenSBI)

The RISC-V Supervisor Binary Interface (SBI) is a recommended interface between:

  1. platform specific firmware running in M-mode and bootloader running in S-mode
  2. platform specific firmware running in M-mode and general purpose operating system running in S-mode
  3. hypervisor runnng in HS-mode and general purpose operating system running in VS-mode.

The RISC-V SBI spec is maintained as independent project by RISC-V Foundation at https://github.com/riscv/riscv-sbi-doc

The RISC-V OpenSBI project aims to provides an open-source and extensible implementation of the SBI spec. This project can be easily extended by RISC-V platform or RISC-V System-on-Chip vendors.

How to Build?

Below are the steps to cross-compile and install RISC-V OpenSBI:

  1. Setup build environment $ CROSS_COMPILE=riscv64-unknown-linux-gnu-

  2. Build sources $ make PLAT=<platform_name> OR $ make PLAT=<platform_name> O=<build_directory>

  3. Install blobs $ make PLAT=<platform_name> install OR $ make PLAT=<platform_name> I=<install_directory> install