RPI学习--环境搭建_更新firmware

（用以解决USB摄像头不识别的状况）

rpi-update是老外开发的一个更新树莓派firmware的工具

$ sudo apt-get update  
$ sudo apt-get install ca-certificates 
$ sudo apt-get install git-core 
$ sudo wget  -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

”

这里先不重启，再输入：

$ 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

”

重启：

$ sudo reboot

重启过后

$ ls /dev

发现有video0了