Linux or WSL
================================

本节主要介绍如何在 Linux 或者 WSL 下使用 **命令行** 进行开发。Windows 下如何安装 WSL 请自行百度。

安装
-----------------

安装前需要下载好 git 工具。

.. code-block:: bash
   :linenos:
   :emphasize-lines: 1

   $ cd ~
   $ sudo apt install git

安装 make
^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: bash
   :linenos:
   :emphasize-lines: 1

   $ cd ~
   $ sudo apt install make

安装 RISC-V 工具链
^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block:: bash
   :linenos:
   :emphasize-lines: 4-5

   $ cd ~
   $ git clone git@gitee.com:bouffalolab/toolchain_gcc_t-head_linux.git
   $ sudo cp -rf toolchain_gcc_t-head_linux/ /usr/bin
   $ echo "export PATH=\"$PATH:/usr/bin/toolchain_gcc_t-head_linux/bin\""  >> ~/.bashrc
   $ source ~/.bashrc

安装检查
-------------

完成上述两步以后，需要检查是否真的安装成功。打开 linux 终端。输入下列命令：

.. code-block:: bash
   :linenos:

   $ make -v

此时应该显示如下内容表示安装成功：

.. code-block:: bash
   :linenos:

    GNU Make 4.1
    Built for x86_64-pc-linux-gnu
    Copyright (C) 1988-2014 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.


.. code-block:: bash
   :linenos:

   $ riscv64-unknown-elf-gcc -v

此时应该显示如下内容表示安装成功：

.. code-block:: bash
   :linenos:

    Using built-in specs.
    COLLECT_GCC=riscv64-unknown-elf-gcc
    COLLECT_LTO_WRAPPER=/mnt/d/EmbeddedSoftware/Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/bin/../libexec/gcc/riscv64-unknown-elf/10.2.0/lto-wrapper
    Target: riscv64-unknown-elf
    Configured with: /lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/./source/riscv/riscv-gcc/configure --target=riscv64-unknown-elf --with-gmp=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/build-Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/lib-for-gcc-x86_64-linux --with-mpfr=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/build-Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/lib-for-gcc-x86_64-linux --with-mpc=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/build-Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/lib-for-gcc-x86_64-linux --with-libexpat-prefix=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/build-Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/lib-for-gcc-x86_64-linux --with-libmpfr-prefix=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/build-Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/lib-for-gcc-x86_64-linux --with-pkgversion='Xuantie-900 elf newlib gcc Toolchain V2.2.5 B-20220323' CXXFLAGS='-g -O2 -DTHEAD_VERSION_NUMBER=2.2.5' --enable-libgcctf --prefix=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5 --disable-shared --disable-threads --enable-languages=c,c++ --with-system-zlib --enable-tls --with-newlib --with-sysroot=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/build-riscv-gcc-riscv64-unknown-elf/Xuantie-900-gcc-elf-newlib-x86_64-V2.2.5/riscv64-unknown-elf --with-native-system-header-dir=/include --disable-libmudflap --disable-libssp --disable-libquadmath --disable-libgomp --disable-nls --disable-tm-clone-registry --src=/lhome/software/toolsbuild/slave2/workspace/Toolchain/build-gnu-riscv_4/./source/riscv/riscv-gcc --enable-multilib --with-abi=lp64d --with-arch=rv64gcxthead 'CFLAGS_FOR_TARGET=-Os   -mcmodel=medany' 'CXXFLAGS_FOR_TARGET=-Os   -mcmodel=medany'
    Thread model: single
    Supported LTO compression algorithms: zlib
    gcc version 10.2.0 (Xuantie-900 elf newlib gcc Toolchain V2.2.5 B-20220323)


在 linux 中，有严格的权限限制，通常一个用户对应一个权限，所以如果提示下面信息，表示需要设置 cmake 权限。

.. figure:: img/cmake_error.png
   :align: center

进入 sdk 根目录，输入:

.. code-block:: bash
   :linenos:

   $ sudo chmod +x tools/cmake/bin/cmake

编译
-------------

进入 **examples** ,选择你想要编译的 case，且该 case 下必须有 **main.c** 文件。生成的 bin 文件会输出到 `build/build_out` 目录下。

.. code-block:: bash
   :linenos:

    $ cd .\examples\helloworld\
    $ make CHIP=chip_name BOARD=board_name ## chip_name 为芯片型号，可以填写 bl702、bl616、bl808、bl606p, board_name 为开发板名称，详见 bsp/board 目录

.. note :: 如果使用 BL808 或者 BL606P，需要在上面基础上添加 CPU_ID=id ,id 可以为 m0 或者 d0