Create RISC-V64_QEMU.md
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## RISC-V QEMU VM Example
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- ENV: Ubuntu 1804 X86
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#### Install Base Package
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```
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apt-get install gcc libc6-dev pkg-config bridge-utils uml-utilities zlib1g-dev \
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libglib2.0-dev autoconf automake libtool libsdl1.2-dev
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```
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#### Build riscv-gnu-toolchain
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```
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sudo apt-get install autoconf automake autotools-dev curl libmpc-dev libmpfr-dev \
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libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev
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git clone --recursive https://github.com/riscv/riscv-gnu-toolchain --depth=1
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./configure --prefix=/opt/riscv-gnu-toolchain_install && make linux -j $(nproc --all)
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echo 'export PATH=/opt/riscv-gnu-toolchain_install/bin:$PATH' >> ~/.bashrc
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source ~/.bashrc
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```
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#### Build Risc-V64 Qemu
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```
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git clone https://git.qemu.org/git/qemu.git --depth=1
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cd qemu
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$ ./configure --target-list=riscv64-linux-user,riscv64-softmmu \
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--prefix=/opt/qemu && make linux -j $(nproc --all)
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```
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#### Build Risc-V64 Kernel
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```
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git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git --depth=1
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make ARCH=riscv defconfig
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make ARCH=riscv menuconfig
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make CROSS_COMPILE=riscv64-unknown-linux-gnu- ARCH=riscv -j $(nproc --all)
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```
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#### Buidl Risc-V64 Debian rootFS
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```
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apt-get install debootstrap qemu-user-static binfmt-support debian-ports-archive-keyring
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debootstrap --arch=riscv64 unstable /home/linux/riscv64-chroot \
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http://mirrors.perfxlab.cn/debian-ports/
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```
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```
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cat >>/etc/network/interfaces <<EOF
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auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet dhcp
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EOF
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```
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```
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cat >>/etc/default/u-boot <<EOF
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U_BOOT_PARAMETERS="rw noquiet root=/dev/vda1"
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U_BOOT_FDT_DIR="noexist"
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EOF
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```
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CP kernel file.
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```
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cp Image /home/linux/riscv64-chroot/boot/
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```
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#### Build Risc-V64 U-Boot
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```
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git clone https://gitee.com/mirrors/u-boot.git --depth=1
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make CROSS_COMPILE=riscv64-unknown-linux-gnu- qemu-riscv64_smode_defconfig
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make CROSS_COMPILE=riscv64-unknown-linux-gnu- -j $(nproc --all)
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```
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#### Build Risc-V OpenSBI
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```
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git clone https://gitee.com/mirrors/OpenSBI.git --depth=1
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make CROSS_COMPILE=riscv64-unknown-linux-gnu- PLATFORM=generic \
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FW_PAYLOAD_PATH=../u-boot/u-boot.bin -j $(nproc --all)
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```
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#### Make Risc-V Qemu DTB
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```
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qemu-virt.dtb
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./qemu-system-riscv64 \
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-nographic \
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-M virt,dumpdtb=qemu-virt.dtb \
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-smp 2 -m 2G \
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-bios ./fw_jump.bin \
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-kernel ./u-boot.bin \
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-append "console=ttyS0 rw root=/dev/vda1"
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```
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```
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dtc -I dtb -O dts -o qemu-virt.dts qemu-virt.dtb
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cp ./qemu-virt* /home/linux/riscv64-chroot/boot/
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```
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#### Make U-boot CMD and SCR
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```
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touch ./u-boot/boot.cmd
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cat >>./u-boot/boot.cmd <<EOF
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load virtio 0:1 0x80200000 /boot/Image
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load virtio 0:1 0x82000000 /boot/qemu-virt.dtb
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booti 0x80200000 - 0x82000000
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EOF
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```
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```
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./u-boot/tools/mkimage -A riscv -O linux -T script \
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-C none -a 0 -e 0 -n "Distro Boot Script" \
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-d ./u-boot/boot.cmd ./u-boot/boot.scr
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cp ./u-boot/boot.scr /home/linux/riscv64-chroot/
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cp ./u-boot/boot.cmd /home/linux/riscv64-chroot/
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```
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#### Make rootFS Image
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```
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apt-get install libguestfs-tools
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virt-make-fs --partition=gpt --type=ext4 --size=384MiB \
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/home/linux/riscv64-chroot rootfs.img
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chown ${USER} rootfs.img
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```
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## Run Testing
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#### Linux
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```
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/bin/bash \
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nohup \
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./qemu-system-riscv64 \
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-nographic \
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-M virt -smp 2 -m 2G \
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-bios ./fw_jump.bin \
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-kernel ./u-boot.bin \
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-object rng-random,filename=/dev/urandom,id=rng0 \
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-device virtio-rng-device,rng=rng0 \
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-device virtio-blk-device,drive=hd0 \
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-drive file=./rootfs.img,format=raw,id=hd0 \
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-device virtio-net-device,netdev=usernet \
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-netdev user,id=usernet,hostfwd=tcp::22222-:22
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```
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#### Windows Example
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```
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"d:\Program Files\qemu\qemu-system-riscv64.exe" \
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-nographic -M virt -m 2G -smp 2 \
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-bios d:\images\riscv64\fw_jump.bin \
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-kernel d:\images\riscv64\u-boot.bin \
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-device virtio-blk-device,drive=hd0 \
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-drive file=d:\images\riscv64\rootfs.img,format=raw,id=hd0 \
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-device virtio-net-device,netdev=usernet -netdev user,id=usernet,hostfwd=tcp::22222-:22
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```
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## Note
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#### For Qemu used 9P
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```
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./configure --enable-gtk --enable-virtfs
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-device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare
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mount -t 9p -o trans=virtio,version=9p2000.L hostshare /mnt/
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```
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