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:orphan:
==========================================
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.
CPU and machine Type
--------------------
The ``qemu-system-loongarch64`` provides emulation for virt
machine. You can specify the machine type ``virt`` and
cpu type ``la464``.
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.
(1) Build qemu-system-loongarch64:
.. code-block:: bash
./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 -j8
(2) Set cross tools:
.. code-block:: bash
wget https://github.com/loongson/build-tools/releases/download/2022.09.06/loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz
tar -vxf loongarch64-clfs-6.3-cross-tools-gcc-glibc.tar.xz -C /opt
export PATH=/opt/cross-tools/bin:$PATH
export LD_LIBRARY_PATH=/opt/cross-tools/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=/opt/cross-tools/loongarch64-unknown-linux-gnu/lib/:$LD_LIBRARY_PATH
Note: You need get the latest cross-tools at https://github.com/loongson/build-tools
(3) Build BIOS:
See: https://github.com/tianocore/edk2-platforms/tree/master/Platform/Loongson/LoongArchQemuPkg#readme
Note: To build the release version of the bios, set --buildtarget=RELEASE,
the bios file path: Build/LoongArchQemu/RELEASE_GCC5/FV/QEMU_EFI.fd
(4) Build kernel:
.. code-block:: bash
git clone https://github.com/loongson/linux.git
cd linux
git checkout loongarch-next
make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- loongson3_defconfig
make ARCH=loongarch CROSS_COMPILE=loongarch64-unknown-linux-gnu- -j32
Note: The branch of linux source code is loongarch-next.
the kernel file: arch/loongarch/boot/vmlinuz.efi
(5) Get initrd:
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
.. code-block:: bash
git clone https://github.com/yangxiaojuan-loongson/qemu-binary
Note: the initrd file is ramdisk
(6) Booting LoongArch:
.. code-block:: bash
$ ./build/qemu-system-loongarch64 -machine virt -m 4G -cpu la464 \
-smp 1 -bios QEMU_EFI.fd -kernel vmlinuz.efi -initrd ramdisk \
-serial stdio -monitor telnet:localhost:4495,server,nowait \
-append "root=/dev/ram rdinit=/sbin/init console=ttyS0,115200" \
--nographic
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