【OpenBMC 系列】2.OpenBMC镜像编译流程以及如何加速编译

1.依赖安装

Yocto
Build Host Packages
You must install essential host packages on your build host. The following command installs the host packages based on an Ubuntu distribution:

sudo apt install gawk wget git diffstat unzip texinfo gcc build-essential chrpath socat cpio python3 python3-pip python3-pexpect xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa libsdl1.2-dev pylint3 xterm python3-subunit mesa-common-dev zstd liblz4-tool
sudo apt-get install -y git build-essential libsdl1.2-dev texinfo gawk chrpath diffstat

2.配置

. setup evb-ast2600

先到build/evb-ast2600目录下，查看配置文件：

cat conf/local.conf

想要加速编译，有如下方法：
（1）使用多线程编译：参考bitbake-user-manual
BB_NUMBER_THREADS : The maximum number of tasks BitBake should run in parallel at any one time. If your host development system supports multiple cores, a good rule of thumb is to set this variable to twice the number of cores.
一般为实际cpu核个数的两倍（本机为4物理核）

gedit openbmc/build/you_project_name/conf/local.conf

填入

BB_NUMBER_THREADS ='8' #(修改编译线程的数量，改为多线程)
PARALLEL_MAKE ='-j 8' #(修改cpu核的数量，根据实际情况修改，不宜超过电脑cpu核数量)

我的理解：
BB_NUMBER_THREA