1、busybox
busybox最轻量
1) 修改Makefile
CROSS_COMPILE ?= /usr/local/gcc-linaro-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
ARCH ?= arm
2) 配置make menuconfig
Busybox Settings --->
[*] Build BusyBox as a static binary (no shared libs)
(/usr/local/gcc-linaro-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-) Cross Compiler prefix
3) 编译，安装
#make
#make install
4) 拷贝Linaro Toolchain依赖的glibc库
在https://releases.linaro.org/components/toolchain/binaries/latest/arm-linux-gnueabihf/
下找到sysroot-glibc-linaro-2.25-2017.11-arm-linux-gnueabihf.7z，拷贝usr和lib两个目录到文件系统
5) 制作引导文件
略
2、buildroot
我用的atmel sama5d3, 看这个文档就够了How to build Buildroot for AT91
http://www.at91.com/linux4sam/bin/view/Linux4SAM/BuildRootBuild
这个是定制的buildroot, 通用版用法也类似。
3、openwrt
https://cnodejs.org/topic/536a402afa61d57127060d40
https://github.com/qianguozheng/nodejs-openwrt/blob/master/Makefile
https://blog.csdn.net/GenRong/article/details/26099311
https://blog.csdn.net/xhoufei2010/article/details/51627417
http://archive.openwrt.org/chaos_calmer/15.05/arm64/generic/
http://archive.openwrt.org/snapshots/trunk/
http://archive.openwrt.org/chaos_calmer/
http://archive.openwrt.org/
https://blog.csdn.net/bless2015/article/details/49798513
Linaro Toolchain
Linaro provides monthly GCC source archive snapshots of the current Linaro GCC release branch, as well as quarterly releases of pre-built Linaro GNU cross-toolchain binary archives.
The following tables provide direct access to the most common Linux and bare-metal ABI variants of the Linaro binary cross-toolchain quarterly releases. Both x86_64 Linux and Mingw32 (MS Windows compatible) host binaries are provided:
Latest Linux Targeted Binary Toolchain Releases
| arm-linux-gnueabihf | 32-bit ARMv7 Cortex-A, hard-float, little-endian | Release-Notes | Binaries | Source |
| armv8l-linux-gnueabihf | 32-bit ARMv8 Cortex-A, hard-float, little-endian | Release-Notes | Binaries | Source |
| aarch64-linux-gnu | 64-bit ARMv8 Cortex-A, little-endian | Release-Notes | Binaries | Source |
Latest Bare-Metal Targeted Binary Toolchain Releases
| arm-eabi | 32-bit ARMv7 Cortex-A, soft-float, little-endian | Release-Notes | Binaries | Source |
| aarch64-elf | 64-bit ARMv8 Cortex-A, little-endian | Release-Notes | Binaries | Source |