本文说明如何在openEuler下搭建Zephyr构建环境.

Zephyr官方文档在Linux下是用Ubuntu作为Zephyr的构建环境，但理论上其它Linux的发行版只要软件包够全也应该能够编译Zephyr，本文做了一些简单的尝试，在openEuler 21.09上成功编译出zephyr并用qemu执行。

安装依赖软件包

sudo dnf -y update

sudo dnf install -y git cmake ninja-build gperf \
  ccache  wget \
  python3-pip python3-setuptools python3-wheel file \
  make gcc

以下软件包在官方文档中要求安装，但openEuler未提供，实际测试不安装也不影响构建：

dfu-util ： dfu用，如果只做编译和一些模拟工作可以不用
xz-utils ：压缩工具，目前构建没遇到问题
device-tree-compiler ： dtc设备树编译工具，Zephyr SDK会提供，因此不安装也不影响
python3-dev ： python的C/C++扩展库，目前不知道是用到那里
python3-tk ： tcl/tk用，应该是给zephyr gui配置用的，我们通过配置文件进行配置，可以不用
gcc-multilib ： 64bit下编译32bit档案用，目前不清楚会影响什么
g++-multilib ： 64bit下编译32bit档案用，目前不清楚会影响什么
libsdl2-dev ： SDL，目前不清楚会影响什么

目前dnf安装的cmake还是3.19版本不满足zephyr的最低需求，使用下面方法安装3.21版本

wget https://github.com/Kitware/CMake/releases/download/v3.21.1/cmake-3.21.1-Linux-x86_64.sh
chmod +x cmake-3.21.1-Linux-x86_64.sh
sudo dnf install tar
sudo ./cmake-3.21.1-Linux-x86_64.sh --skip-license --prefix=/usr/local
hash -r

下载Zephyr与安装Python依赖

1 安装west

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pip3 install --user -U west
echo 'export PATH=~/.local/bin:"$PATH"' >> ~/.bashrc
source ~/.bashrc

2 下载Zephyr代码

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west init ~/zephyrproject
cd ~/zephyrproject
west update

3 导出zephyr cmake package

1	est zephyr-export

4 安装Python依赖

1	pip3 install --user -r ~/zephyrproject/zephyr/scripts/requirements.txt

安装Zephyr SDK

Zephyr SDK中包含了各个架构的Toolchain和一些工具
1 下载SDK

1 2	cd ~ wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.13.1/zephyr-sdk-0.13.1-linux-x86_64-setup.run

2 安装SDK

1 2	chmod +x zephyr-sdk-0.13.1-linux-x86_64-setup.run ./zephyr-sdk-0.13.1-linux-x86_64-setup.run -- -d ~/zephyr-sdk-0.13.1

编译和测试

基于qemu_cortex_m3用shell sample进行编译测试

1	west build -b qemu_cortex_m3 zephyr/samples/subsys/shell/shell_module/

可以正常编译完，看到

-- west build: building application
[1/169] Preparing syscall dependency handling

[159/169] Linking C executable zephyr/zephyr_pre0.elf

[163/169] Linking C executable zephyr/zephyr_pre1.elf

[169/169] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:       50924 B       256 KB     19.43%
            SRAM:       12480 B        64 KB     19.04%
        IDT_LIST:          0 GB         2 KB      0.00%

执行下面命令跑qemu进行测试

1	west build -t run

可以看到正常运行起来zephyr的shell

[frank@localhost zephyrproject]$ west build -t run
-- west build: running target run
[0/1] To exit from QEMU enter: 'CTRL+a, x'[QEMU] CPU: cortex-m3
qemu-system-arm: warning: nic stellaris_enet.0 has no peer
Timer with period zero, disabling


uart:~$ help
Please press the <Tab> button to see all available commands.
You can also use the <Tab> button to prompt or auto-complete all commands or its subcommands.
You can try to call commands with <-h> or <--help> parameter for more information.

Shell supports following meta-keys:
  Ctrl + (a key from: abcdefklnpuw)
  Alt  + (a key from: bf)
Please refer to shell documentation for more details.

Available commands:
  bypass              :Bypass shell
  clear               :Clear screen.
  date                :Date commands
  demo                :Demo commands
  device              :Device commands
  devmem              :Read/write physical memory"devmem address [width [value]]
  dynamic             :Demonstrate dynamic command usage.
  help                :Prints the help message.
  history             :Command history.
  kernel              :Kernel commands
  log                 :Commands for controlling logger
  log_test            :Log test
  resize              :Console gets terminal screen size or assumes default in
                       case the readout fails. It must be executed after each
                       terminal width change to ensure correct text display.
  shell               :Useful, not Unix-like shell commands.
  shell_uart_release  :Uninitialize shell instance and release uart, start
                       loopback on uart. Shell instance is renitialized when 'x'
                       is pressed
  stats               :Stats commands
  version             :Show kernel version
uart:~$