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+# QEMU/RISCV64 VIRT板级支持包说明
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+
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+## 1. 简介
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+
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+RISC-V是一种开放和免费的指令集体系结构(ISA)。本工程是在QEMU的RISCV64 VIRT版本上进行的一份移植。
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+
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+## 2. 编译说明
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+
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+首先可以下载交叉编译工具链,建议采用sifive的工具链进行编译。
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+```
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+https://www.sifive.com/software
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+```
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+选择对应的平台即可。
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+
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+这里推荐在Ubuntu上进行开发工作。
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+
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+解压工具链到指定的目录。
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+
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+```
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+export RTT_EXEC_PATH=~/gcc/bin
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+```
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+
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+进入到`rt-thread/bsp/qemu-riscv-virt64`目录进行输入
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+```
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+scons
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+```
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+可以看到正常生成`rtthread.elf`与`rtthread.bin`文件。
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+
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+## 3. 执行
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+
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+本工程提供了riscv64的两种可配置运行模式,默认运行在M-Mode下。
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+
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+*M-Mode*
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+
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+首先安装`qemu-system-riscv64`。
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+
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+```
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+sudo apt install qemu-system-misc
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+```
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+直接输入
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+```
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+./qemu-nographic.sh
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+```
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+可以看到程序运行
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+
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+```
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+heap: [0x80035804 - 0x86435804]
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+
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+ \ | /
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+- RT - Thread Operating System
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+ / | \ 4.0.4 build May 21 2021
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+ 2006 - 2021 Copyright by rt-thread team
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+Hello RISC-V!
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+msh />
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+```
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+
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+*S-Mode*
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+
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+如果运行在S-Mode下，那么需要通过menuconfig选择配置
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+
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+```
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+scons --menuconfig
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+```
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+选择如下：
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+```
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+RISCV qemu virt64 configs --->
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+ [*] RT-Thread run in riscv smode
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+```
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+保存后，重新`scons`编译即可。
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+
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+要让rt-thread运行在S-Mode，首先需要启动opensbi,然后通过opensbi启动rt-thread。
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+
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+自行编译的qemu或者下载的高版本的qemu内置opensbi，执行`./qemu-nographic-smode.sh`即可正常运行。
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+
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+通过`sudo apt install qemu-system-misc`安装的qemu版本较低，可自行编译opensbi。
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+
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+```
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+git clone git@github.com:riscv/opensbi.git
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+cd opensbi
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+make PLATFORM=generic CROSS_COMPILE=~/gcc/bin/riscv64-unknown-elf-
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+```
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+最后生成的`/build/platform/generic/firmware/fw_jump.elf`则是需要的文件。
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+
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+输入以下的命令即可运行:
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+
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+```
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+qemu-system-riscv64 -nographic -machine virt -m 256M -kernel rtthread.bin -bios ~/opensbi/build/platform/generic/firmware/fw_jump.elf
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+```
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+可以看到如下的结果
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+```
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+OpenSBI v0.9
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+ ____ _____ ____ _____
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+ / __ \ / ____| _ \_ _|
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+ | | | |_ __ ___ _ __ | (___ | |_) || |
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+ | | | | '_ \ / _ \ '_ \ \___ \| _ < | |
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+ | |__| | |_) | __/ | | |____) | |_) || |_
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+ \____/| .__/ \___|_| |_|_____/|____/_____|
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+ | |
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+ |_|
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+
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+Platform Name : riscv-virtio,qemu
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+Platform Features : timer,mfdeleg
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+.
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+.
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+.
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+Boot HART ISA : rv64imafdcsu
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+Boot HART Features : scounteren,mcounteren
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+Boot HART PMP Count : 16
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+Boot HART PMP Granularity : 4
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+Boot HART PMP Address Bits: 54
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+Boot HART MHPM Count : 0
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+Boot HART MHPM Count : 0
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+Boot HART MIDELEG : 0x0000000000000222
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+Boot HART MEDELEG : 0x000000000000b109
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+heap: [0x80235a58 - 0x86635a58]
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+
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+ \ | /
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+- RT - Thread Operating System
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+ / | \ 4.0.4 build May 21 2021
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+ 2006 - 2021 Copyright by rt-thread team
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+Hello RISC-V!
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+msh />
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+```
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+## 4. 支持情况
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+
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+| 驱动 | 支持情况 | 备注 |
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+| ------ | ---- | :------: |
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+| UART | 支持 | UART0 |
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+| PLIC | 支持 | - |
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+| CLIC | 支持 | - |
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+
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+## 5. 联系人信息
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+
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+维护人：[bernard][1]
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+
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+[1]: https://github.com/BernardXiong
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bigmagic