buildroot
1. Building out-of-tree
$ make O=output/xxx xxx_defconfig # 配置buildroot
$ cd output/xxx
$ make <target>2. how to rebuild packages
$ cd output/xxx
$ make menuconfig
$ make <package>-dirclean # 完全删除
$ make <package>-reconfigure # 重新配置、编译、安装
$ make <package>-rebuild # 重新编译、安装
$ make <package>-reinstall # 重新安装3. linux kernel 无法引导 buildroot编译的rootfs
4. 添加本地源码包到buildroot
参考网址
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