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Last modification on 2021-10-26

This describes how to setup an OpenBSD RISCV64 VM in QEMU.

The shellscript below does the following:

* Set up the disk image (raw format).

* Patch the disk image with the OpenBSD miniroot file for the installation.

* Downloads the opensbi and u-boot firmware files for qemu.

* Run the VM with the supported settings.

The script is tested on the host GNU/Void Linux and OpenBSD-current.

**IMPORTANT!: The signature and checksum for the miniroot, u-boot and opensbi

files are not verified. If the host is OpenBSD make sure to instead install the

packages (pkg_add u-boot-riscv64 opensbi) and adjust the firmware path for the

qemu -bios and -kernel options. **

#!/bin/sh

# mirror list: https://www.openbsd.org/ftp.html

mirror='https://ftp.bit.nl/pub/OpenBSD/'

release='7.0'

minirootname='miniroot70.img'

miniroot() {

test -f '${minirootname}' && return # download once

url='${mirror}/${release}/riscv64/${minirootname}'

curl -o '${minirootname}' '${url}'

}

createrootdisk() {

test -f disk.raw && return # create once

qemu-img create disk.raw 10G # create 10 GB disk

dd conv=notrunc if=${minirootname} of=disk.raw # write miniroot to disk

}

opensbi() {

f='opensbi.tgz'

test -f '${f}' && return # download and extract once.

url='${mirror}/${release}/packages/amd64/opensbi-0.9p0.tgz'

curl -o '${f}' '${url}'

tar -xzf '${f}' share/opensbi/generic/fw_jump.bin

}

uboot() {

f='uboot.tgz'

test -f '${f}' && return # download and extract once.

url='${mirror}/${release}/packages/amd64/u-boot-riscv64-2021.07p0.tgz'

curl -o '${f}' '${url}'

tar -xzf '${f}' share/u-boot/qemu-riscv64_smode/u-boot.bin

}

setup() {

miniroot

createrootdisk

opensbi

uboot

}

run() {

qemu-system-riscv64

-machine virt

-nographic

-m 2048M

-smp 2

-bios share/opensbi/generic/fw_jump.bin

-kernel share/u-boot/qemu-riscv64_smode/u-boot.bin

-drive file=disk.raw,format=raw,id=hd0 -device virtio-blk-device,drive=hd0

-netdev user,id=net0,ipv6=off -device virtio-net-device,netdev=net0

}

setup

run

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