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doc: Update build instructions for riscv64 architecture (#725)

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docs/introduction/build_system.md
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@ -251,3 +251,32 @@ make run-docker
qemu虚拟机将在5900端口监听vnc连接。您可以使用vnc viewer或者Remmina连接至qemu虚拟机。
:::
## 7. 为riscv64编译
由于目前DragonOS尚未完全移植到riscv64，因此编译需要这样做：
1. 修改`env.mk`和`.vscode/settings.json`
把`env.mk`里面的`ARCH`的值改为`riscv64`，并且在`setting.json`里面注释`"rust-analyzer.cargo.target": "x86_64-unknown-none",`，改为启用riscv64的那行。
2. 重启rust-analyzer
3. 清理编译缓存
由于x86_64和riscv64架构差异，可能存在缓存导致的编译问题，确保运行前先清理缓存。
```shell
make clean
```
4. 为riscv64编译并运行
```shell
# 下载DragonStub
git submodule update --init --recursive --force
make kernel -j $(nproc) && make write_diskimage && make qemu
```
请注意，由于是在控制台运行qemu，当你想要退出的时候，输入`Ctrl+A`然后按`X`即可。