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diff --git a/docs/system/loongarch/virt.rst b/docs/system/loongarch/virt.rst new file mode 100644 index 0000000000..c37268b404 --- /dev/null +++ b/docs/system/loongarch/virt.rst @@ -0,0 +1,108 @@ +: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 |