docs: add a tutorial on use U-Boot and OpenSBI to boot Ubuntu in qemu

docs/booting-ubuntu-24.04.1-in-qemu-using-uboot-and-rustsbi.md

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+# 使用RustSBI & U-Boot在QEMU中启动 Ubuntu 24.04.1
+
+本教程给出了使用RustSBI和U-Boot在QEMU中启动Ubuntu 24.04.1的基本流程。
+
+本教程使用软件版本如下：
+
+|         软件          |  版本   |
+| :-------------------: | :-----: |
+| riscv64-linux-gnu-gcc | 14.1.0  |
+|  qemu-system-riscv64  |  9.0.1  |
+|  RustSBI Prototyper   |  0.0.0  |
+|        U-Boot         | 2024.04 |
+
+## 准备RustSBI Prototyper， U-Boot ，Ubuntu 24.04.1
+创建工作目录并进入该目录
+
+``` shell
+$ mkdir workshop && cd workshop
+```
+
+### Clone RustSBI Prototyper
+
+``` shell
+$ git clone https://github.com/rustsbi/prototyper.git && cd prototyper && git checkout main && cd ..
+```
+
+### Clone U-Boot
+
+``` shell
+$ git clone https://github.com/u-boot/u-boot.git && cd u-boot && git checkout v2024.04 && cd ..
+```
+### 下载并扩容 Ubuntu 24.04.1 磁盘镜像文件
+
+下载链接：[Ubuntu 24.04.1](https://cdimage.ubuntu.com/releases/noble/release/ubuntu-24.04.1-preinstalled-server-riscv64.img.xz)
+```shell
+ $ unar ubuntu-24.04.1-preinstalled-server-riscv64.img.xz
+ $ qemu-img resize -f raw ubuntu-24.04.1-preinstalled-server-riscv64.img +5G
+```
+
+- The password of the default user `ubuntu` is `ubuntu`.
+- 登录后应会被要求更改登录密码。
+- 可以通过 `sudo` 更改 root 密码。
+
+
+## 编译RustSBI  Prototyper
+
+进入prototyper目录
+
+``` shell
+$ cd prototyper
+```
+
+编译RustSBI  Prototyper
+
+``` shell
+$ cargo make prototyper
+```
+
+## 编译U-Boot SPL
+
+进入U-Boot目录
+
+``` shell
+$ cd u-boot
+```
+
+导出环境变量
+
+``` shell
+$ export ARCH=riscv
+$ export CROSS_COMPILE=riscv64-linux-gnu-
+$ export OPENSBI=../prototyper/target/riscv64imac-unknown-none-elf/release/rustsbi-prototyper.bin 
+```
+
+生成`.config`文件,编译U-Boot
+
+``` shell
+# To generate .config file out of board configuration file
+$ make qemu-riscv64_spl_defconfig
+$ make -j$(nproc)
+```
+
+## 使用RustSBI 原型系统和U-Boot启动 Ubuntu 24.04.1
+
+进入`workshop`目录
+
+``` shell
+$ cd workshop
+```
+
+运行下面命令
+
+``` shell
+$ qemu-system-riscv64 \
+    -nographic -machine virt \
+    -smp 4 -m 8G \
+    -bios ./u-boot/spl/u-boot-spl  \
+    -device loader,file=./u-boot/u-boot.itb,addr=0x80200000 \
+    -drive file=ubuntu-24.04.1-preinstalled-server-riscv64.img,format=raw,if=none,id=hd0 \
+    -object rng-random,filename=/dev/urandom,id=rng0 \
+    -device virtio-vga \
+    -device virtio-rng-device,rng=rng0 \
+    -device virtio-blk-device,drive=hd0 \
+    -device virtio-net-device,netdev=usernet \
+    -netdev user,id=usernet,hostfwd=tcp::12055-:22 \
+    -device qemu-xhci -usb -device usb-kbd -device usb-tablet
+```