官方推荐使用SDK来作为Zephyr的开发环境，我的环境是Ubuntu18.04 Server(带桌面）+ zephyr-sdk(190428使用的是0.10.0版本)
Zephyr的开发环境的搭建，大致如下图，当前的笔记是“红底”框图处。参考自: https://docs.zephyrproject.org/latest/getting_started/installation_linux.html
通过wget https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v0.10.0/zephyr-sdk-0.10.0-setup.run来下，除非是翻墙，否则只能以几十K的速度下载787MB的SDK文件，还是不要尝试了。
我是通过这个地址下的：https://pan.baidu.com/s/155GLI65RWtduOHXXSsnQKQ 提取码: 8p7c 下载的。下载后，执行：
cd <sdk download directory>
sh zephyr-sdk-0.10.0-setup.run //直接输入，这里tab智能提示是无效的。
Follow the installation instructions on the screen. The toolchain’s default installation location is /opt/zephyr-sdk/, but it is recommended to install the SDK under your home directory instead.
以下为实际操作：
qzm@qzm-nb:~/zephyr_ws$ sh zephyr-sdk-0.10.0-setup.run
Verifying archive integrity... All good.
Enter target directory for SDK (default: /opt/zephyr-sdk/): /home/qzm/zephyr_ws/sdk-0.10.0
Installing SDK to /home/qzm/zephyr_ws/sdk-0.10.0
[*] Installing x86 tools...
[*] Installing arm tools...
[*] Installing arc tools...
[*] Installing iamcu tools...
[*] Installing nios2 tools...
[*] Installing xtensa tools...
[*] Installing riscv32 tools...
[*] Installing additional host tools...
Success installing SDK. SDK is ready to be used.
我的Zephyr workspace的组织如下图所示：
To use the Zephyr SDK, export the following environment variables and use the target location where SDK was installed:
export ZEPHYR_TOOLCHAIN_VARIANT=zephyr
export ZEPHYR_SDK_INSTALL_DIR=<sdk installation directory>我是在~/.bashrc的最后加上下面的变量定义和输出变量的语句。
#qA190309
export PATH=/home/qzm/bin/cmake-3.13.4-Linux-x86_64/bin:$PATH
export PATH=/home/qzm/.local/bin:$PATH
export ZEPHYR_TOOLCHAIN_VARIANT=zephyr
export ZEPHYR_SDK_INSTALL_DIR=/home/qzm/zephyr_ws/sdk-0.10.0
export ZEPHYR_BASE=/home/qzm/zephyr_ws/zephyrproject/zephyr
致此，在ubuntu18.04 server下搭建基于SDK的Zephyr开发环境完成了，现在，我们就可以进行实际的应用开发或者板级的BSP和驱动开发了。
