| 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, :ref:`user mode<usermode_api>`, several |
| ISA extensions as well as :ref:`semihosting<semihost_guide>`. |
| |
| 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 :file:`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. |
