loongson3 virt generic platform (`virt`)

The virt machine use gpex host bridge, and there are some emulated devices on virt board, such as loongson7a RTC device, IOAPIC device, ACPI device and so on.

Supported devices

The virt machine supports: - Gpex host bridge - Ls7a RTC device - Ls7a IOAPIC device - ACPI GED device - Fw_cfg device - PCI/PCIe devices - Memory device - CPU device. Type: la464-loongarch-cpu.

CPU and machine Type

The qemu-system-loongarch64 provides emulation for virt machine. You can specify the machine type virt and cpu type la464-loongarch-cpu.

Boot options

We can boot the LoongArch virt machine by specifying the uefi bios, initrd, and linux kernel. And those source codes and binary files can be accessed by following steps.

booting command:

$ qemu-system-loongarch64 -machine virt -m 4G -cpu la464-loongarch-cpu \
    -smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd initrd.img \
    -append "root=/dev/ram rdinit=/sbin/init console=ttyS0,115200" \
    --nographic

Note: The running speed may be a little slow, as the performance of our qemu and uefi bios is not perfect, and it is being fixed.

cross compiler tools:

wget https://github.com/loongson/build-tools/releases/download/ \
2022.05.29/loongarch64-clfs-5.0-cross-tools-gcc-full.tar.xz

tar -vxf loongarch64-clfs-5.0-cross-tools-gcc-full.tar.xz

qemu compile configure option:

./configure --disable-rdma --disable-pvrdma --prefix=usr \
            --target-list="loongarch64-softmmu" \
            --disable-libiscsi --disable-libnfs --disable-libpmem \
            --disable-glusterfs --enable-libusb --enable-usb-redir \
            --disable-opengl --disable-xen --enable-spice \
            --enable-debug --disable-capstone --disable-kvm \
            --enable-profiler
make

uefi bios source code and compile method:

git clone https://github.com/loongson/edk2-LoongarchVirt.git

cd edk2-LoongarchVirt

git submodule update --init

export PATH=$YOUR_COMPILER_PATH/bin:$PATH

export WORKSPACE=`pwd`

export PACKAGES_PATH=$WORKSPACE/edk2-LoongarchVirt

export GCC5_LOONGARCH64_PREFIX=loongarch64-unknown-linux-gnu-

edk2-LoongarchVirt/edksetup.sh

make -C edk2-LoongarchVirt/BaseTools

build --buildtarget=DEBUG --tagname=GCC5 --arch=LOONGARCH64  --platform=OvmfPkg/LoongArchQemu/Loongson.dsc

build --buildtarget=RELEASE --tagname=GCC5 --arch=LOONGARCH64  --platform=OvmfPkg/LoongArchQemu/Loongson.dsc

The efi binary file path:

Build/LoongArchQemu/DEBUG_GCC5/FV/QEMU_EFI.fd

Build/LoongArchQemu/RELEASE_GCC5/FV/QEMU_EFI.fd

linux kernel source code and compile method:

git clone https://github.com/loongson/linux.git

export PATH=$YOUR_COMPILER_PATH/bin:$PATH

export LD_LIBRARY_PATH=$YOUR_COMPILER_PATH/lib:$LD_LIBRARY_PATH

export LD_LIBRARY_PATH=$YOUR_COMPILER_PATH/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH

make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig

make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu-

make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- install

make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- modules_install

Note: The branch of linux source code is loongarch-next.

initrd file:

You can use busybox tool and the linux modules to make a initrd file. Or you can access the binary files: https://github.com/yangxiaojuan-loongson/qemu-binary

loongson3 virt generic platform (virt)

Supported devices

CPU and machine Type

Boot options

loongson3 virt generic platform (`virt`)