130 lines
3.7 KiB
ReStructuredText
130 lines
3.7 KiB
ReStructuredText
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==========================================
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loongson3 virt generic platform (``virt``)
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==========================================
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The ``virt`` machine use gpex host bridge, and there are some
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emulated devices on virt board, such as loongson7a RTC device,
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IOAPIC device, ACPI device and so on.
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Supported devices
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-----------------
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The ``virt`` machine supports:
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- Gpex host bridge
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- Ls7a RTC device
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- Ls7a IOAPIC device
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- ACPI GED device
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- Fw_cfg device
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- PCI/PCIe devices
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- Memory device
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- CPU device. Type: la464-loongarch-cpu.
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CPU and machine Type
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--------------------
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The ``qemu-system-loongarch64`` provides emulation for virt
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machine. You can specify the machine type ``virt`` and
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cpu type ``la464-loongarch-cpu``.
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Boot options
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------------
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We can boot the LoongArch virt machine by specifying the uefi bios,
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initrd, and linux kernel. And those source codes and binary files
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can be accessed by following steps.
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(1) booting command:
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.. code-block:: bash
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$ qemu-system-loongarch64 -machine virt -m 4G -cpu la464-loongarch-cpu \
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-smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd initrd.img \
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-append "root=/dev/ram rdinit=/sbin/init consol e=ttyS0,115200" \
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--nographic
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Note: The running speed may be a little slow, as the performance of our
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qemu and uefi bios is not perfect, and it is being fixed.
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(2) cross compiler tools:
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.. code-block:: bash
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wget https://github.com/loongson/build-tools/releases/download/ \
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2022.05.29/loongarch64-clfs-5.0-cross-tools-gcc-full.tar.xz
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tar -vxf loongarch64-clfs-5.0-cross-tools-gcc-full.tar.xz
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(3) qemu compile configure option:
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.. code-block:: bash
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./configure --disable-rdma --disable-pvrdma --prefix=usr \
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--target-list="loongarch64-softmmu" \
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--disable-libiscsi --disable-libnfs --disable-libpmem \
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--disable-glusterfs --enable-libusb --enable-usb-redir \
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--disable-opengl --disable-xen --enable-spice \
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--enable-debug --disable-capstone --disable-kvm \
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--enable-profiler
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make
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(4) uefi bios source code and compile method:
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.. code-block:: bash
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git clone https://github.com/loongson/edk2-LoongarchVirt.git
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cd edk2-LoongarchVirt
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git submodule update --init
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export PATH=$YOUR_COMPILER_PATH/bin:$PATH
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export WORKSPACE=`pwd`
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export PACKAGES_PATH=$WORKSPACE/edk2-LoongarchVirt
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export GCC5_LOONGARCH64_PREFIX=loongarch64-unknown-linux-gnu-
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edk2-LoongarchVirt/edksetup.sh
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make -C edk2-LoongarchVirt/BaseTools
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build --buildtarget=DEBUG --tagname=GCC5 --arch=LOONGARCH64 --platform=OvmfPkg/LoongArchQemu/Loongson.dsc
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build --buildtarget=RELEASE --tagname=GCC5 --arch=LOONGARCH64 --platform=OvmfPkg/LoongArchQemu/Loongson.dsc
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The efi binary file path:
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Build/LoongArchQemu/DEBUG_GCC5/FV/QEMU_EFI.fd
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Build/LoongArchQemu/RELEASE_GCC5/FV/QEMU_EFI.fd
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(5) linux kernel source code and compile method:
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.. code-block:: bash
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git clone https://github.com/loongson/linux.git
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export PATH=$YOUR_COMPILER_PATH/bin:$PATH
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export LD_LIBRARY_PATH=$YOUR_COMPILER_PATH/lib:$LD_LIBRARY_PATH
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export LD_LIBRARY_PATH=$YOUR_COMPILER_PATH/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH
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make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig
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make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu-
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make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- install
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make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- modules_install
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Note: The branch of linux source code is loongarch-next.
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(6) initrd file:
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You can use busybox tool and the linux modules to make a initrd file. Or you can access the
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binary files: https://github.com/yangxiaojuan-loongson/qemu-binary
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