Support for RISC-V QEMU virt platform

Overview

RISC-V QEMU ‘virt’ is a generic platform which does not correspond to any real hardware.

EDK2 for RISC-V virt platform is a payload (S-mode) for the previous stage M-mode firmware like OpenSBI. It follows PEI less design.

The minimum QEMU version required is 8.1 or with commit 7efd65423a which supports separate pflash devices for EDK2 code and variable storage.

Get edk2 sources

git clone --recurse-submodule git@github.com:tianocore/edk2.git

Build

Using GCC toolchain

Prerequisite: RISC-V GNU compiler toolchain should be installed.

export WORKSPACE=`pwd`
export GCC5_RISCV64_PREFIX=riscv64-linux-gnu-
export PACKAGES_PATH=$WORKSPACE/edk2
export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
source edk2/edksetup.sh --reconfig
make -C edk2/BaseTools
source edk2/edksetup.sh BaseTools
build -a RISCV64 --buildtarget RELEASE -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t GCC5

Using CLANGDWARF toolchain (clang + lld)

Prerequisite: LLVM toolchain with clang and lld should be installed.

export WORKSPACE=`pwd`
export CLANGDWARF_BIN=/usr/bin/
export PACKAGES_PATH=$WORKSPACE/edk2
export EDK_TOOLS_PATH=$WORKSPACE/edk2/BaseTools
source edk2/edksetup.sh --reconfig
make -C edk2/BaseTools
source edk2/edksetup.sh BaseTools
build -a RISCV64 --buildtarget RELEASE -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t CLANGDWARF

After a successful build, two files namely RISCV_VIRT_CODE.fd and RISCV_VIRT_VARS.fd are created.

Test

Below example shows how to boot openSUSE Tumbleweed E20.

RISC-V QEMU pflash devices should be of of size 32MiB.
truncate -s 32M RISCV_VIRT_CODE.fd
truncate -s 32M RISCV_VIRT_VARS.fd

Running QEMU

 qemu-system-riscv64 \
 -M virt,pflash0=pflash0,pflash1=pflash1,acpi=off \
 -m 4096 -smp 2 \
 -serial mon:stdio \
 -device virtio-gpu-pci -full-screen \
 -device qemu-xhci \
 -device usb-kbd \
 -device virtio-rng-pci \
 -blockdev node-name=pflash0,driver=file,read-only=on,filename=RISCV_VIRT_CODE.fd \
 -blockdev node-name=pflash1,driver=file,filename=RISCV_VIRT_VARS.fd \
 -netdev user,id=net0 \
 -device virtio-net-pci,netdev=net0 \
 -device virtio-blk-device,drive=hd0 \
 -drive file=openSUSE-Tumbleweed-RISC-V-E20-efi.riscv64.raw,format=raw,id=hd0