用rpi-update轻松实现firmware更新！

rpi-update是老外开发的一个更新树莓派firmware的工具，很方便也很好用，推荐给大家!
红色部分是需要输入的：
$ sudo apt-get update
$ sudo apt-get install ca-certificates
$ sudo apt-get install git-core
$ sudo wget http://goo.gl/1BOfJ -O /usr/bin/rpi-update
$ sudo chmod +x /usr/bin/rpi-update
$ sudo rpi-update
Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS
Performing self-update
Autodetecting memory split
Using ARM/GPU memory split of 192MB/64MB
We’re running for the first time
Setting up firmware (this will take a few minutes)
Using SoftFP libraries
/opt/vc/sbin/vcfiled: error while loading shared libraries:libvchiq_arm.so: cannot open shared object file: No such file or directory
If no errors appeared, your firmware was successfully setup
A reboot is needed to activate the new firmware
$ sudo ldconfig
$ sudo rpi-update
Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS
Performing self-update
Autodetecting memory split
Using ARM/GPU memory split of 192MB/64MB
Updating firmware (this will take a few minutes)
Your firmware is already up to date
$ sudo reboot
备注：
09-18版本以后的官方镜像都集成了rpi-update工具，直接执行“sudo rpi-update”就行了，不需要再安装

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