Zephyr support status on RISC-V processors

Overview

This page describes current state of Zephyr for RISC-V processors. Currently, there’s support for some boards, as well as Qemu support and support for some FPGA implementations such as neorv32 and litex_vexriscv.

Zephyr support includes PMP, user mode, several ISA extensions as well as semihosting.

User mode and PMP support

When the platform has Physical Memory Protection (PMP) support, enabling it on Zephyr allows user space support and stack protection to be selected.

ISA extensions

It’s possible to set in Zephyr which ISA extensions (RV32/64I(E)MAFD(G)QC) are available on a given platform, by setting the appropriate RISCV_ISA_* kconfig. Look at arch/riscv/Kconfig.isa for more information.

Note that Zephyr SDK toolchain support may not be defined for all combinations.

SMP support

SMP is supported on RISC-V, but currently only on Qemu platforms. In order to test the SMP support, one can use qemu_riscv32_smp or qemu_riscv64_smp boards.