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working-with-ubuntu-riscv-unmatched.md

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Compiling tools

Compiling the riscv toolchain

Docs: [https://github.com/riscv/riscv-gnu-toolchain]

git clone https://github.com/riscv/riscv-gnu-toolchain --recursive -j 10
cd riscv-gnu-toolchain
./configure --prefix=$HOME/opt/riscv
make linux -j 100

# adding riscv binaries to path
echo "export PATH=$PATH:$HOME/opt/riscv/bin" > ~/.bashrc

Compiling qemu

Docs: [https://github.com/qemu/qemu] Docs: [https://wiki.qemu.org/Documentation/Platforms/RISCV]

sudo apt-get install ninja-build
git clone https://github.com/qemu/qemu
cd qemu
 ./configure --target-list=riscv64-softmmu
 make -j 100

Getting bios and bootloader for booting Ubuntu in qemu

Docs: [https://wiki.ubuntu.com/RISC-V] The doc says:

Prerequisites:
apt install qemu-system-misc opensbi u-boot-qemu qemu-utils
Hirsute's version of u-boot-qemu is required at the moment to boot hirsute images.

If the host machine is not Ubuntu 21.04 (Hirsute Hippo), the following steps will install the above packages using Hirsute's version.

Note: the "Hirsute's version" can be obtained here: [https://packages.ubuntu.com/hirsute/u-boot-qemu]

wget http://mirrors.kernel.org/ubuntu/pool/main/u/u-boot/u-boot-qemu_2021.01+dfsg-3ubuntu9_all.deb
sudo dpkg -i u-boot-qemu_2021.01+dfsg-3ubuntu9_all.deb
sudo apt-get install -f

The files of interest are:

  • /usr/lib/riscv64-linux-gnu/opensbi/generic/fw_jump.elf
  • /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf

Disk image stuff

Obtaining the disk image

Docs: [https://wiki.ubuntu.com/RISC-V]

wget https://cdimage.ubuntu.com/releases/21.04/release/ubuntu-21.04-preinstalled-server-riscv64+unmatched.img.xz    # downloading the disk image
xz -dk ubuntu-21.04-preinstalled-server-riscv64+unmatched.img.xz                                                    # unpacking/decompressing the disk image
mv ubuntu-21.04-preinstalled-server-riscv64+unmatched.img ubuntu.img                                                # renaming the disk image
qemu-img resize -f raw ubuntu.img +30G                                                                              # adding 30GB to the disk

We'll have to boot the disk image to resize /dev/vda later.

Booting Ubuntu with QEMU

Docs: [https://wiki.ubuntu.com/RISC-V]

Normal booting

./qemu/build/qemu-system-riscv64 -machine virt -nographic \
     -m 16384 -smp 8 \
     -bios /usr/lib/riscv64-linux-gnu/opensbi/generic/fw_jump.elf \
     -kernel /usr/lib/u-boot/qemu-riscv64_smode/uboot.elf \
     -device virtio-net-device,netdev=eth0 \
     -netdev user,id=eth0,hostfwd=tcp::5555-:22 \
     -drive file=ubuntu.img,format=raw,if=virtio

The above command will forward the port 22 of guest to port 5555 of host.
After running the ssh server, one can ssh to the guest by,

ssh ubuntu@localhost -p 5555

Launching the ssh server,

/etc/init.d/ssh start

First time booting

Username: ubuntu
Password: ubuntu

Stop cloud-init, install tools

Docs: [https://askubuntu.com/questions/539277/how-to-get-rid-of-cloud-init]

sudo touch /etc/cloud/cloud-init.disabled # stop cloud-init
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install build-essential gparted

Resize the data partition

resize2fs /dev/vda1