1.安装ssh工具

sudo apt-get install openssh-server 

2.下载教程编译器
Linaro GCC 编译器下载地址如下：
https://releases.linaro.org/components/toolchain/binaries/latest-7/arm-linux-gnueabihf/
最新版本 u-boot启动有问题，下载4.9版本的编译器，下载地址为 ：
https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-linux-gnueabihf/
关注这两种:
gcc-linaro-4.9.4-2017.01-i686_arm-linux-gnueabihf.tar.tar.xz
和gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz，
第一个是针对 32 位系统的，第二个是针对 64 位系统的
3.下载到拷贝到对应目录

sudo mkdir /usr/local/arm
sudo tar -vxf gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf.tar.xz

把对应的bin目录加到环境变量中

/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin

添加到/etc/profile中去，前面加上export PATH=$PATH:，最后就是

export PATH=$PATH:/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin

4.安装额外的c库

sudo apt-get install lsb-core lib32stdc++6 

5.验证编译器
记得拷贝完source /etc/profile，指令arm-linux-gnueabihf-gcc -v

klaus@ubuntu:~$ source /etc/profile
klaus@ubuntu:~$ arm-linux-gnueabihf-gcc -v 
Using built-in specs.
COLLECT_GCC=arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/usr/local/arm/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabihf/bin/../libexec/gcc/arm-linux-gnueabihf/4.9.4/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: /home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/snapshots/gcc-linaro-4.9-2017.01/configure SHELL=/bin/bash --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto --enable-objc-gc --enable-shared --without-included-gettext --enable-nls --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no --with-isl=no --disable-multilib --with-float=hard --with-mode=thumb --with-tune=cortex-a9 --with-arch=armv7-a --with-fpu=vfpv3-d16 --enable-threads=posix --enable-multiarch --enable-libstdcxx-time=yes --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/sysroots/arm-linux-gnueabihf --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-linux-gnueabihf/libc --enable-checking=release --disable-bootstrap --enable-languages=c,c++,fortran,lto --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-linux-gnueabihf --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release/label/docker-trusty-amd64-tcwg-build/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: posix
gcc version 4.9.4 (Linaro GCC 4.9-2017.01) 
klaus@ubuntu:~$