因为没有HDMI的显示器，总之就是没有显示器来显示，想起RPi上有TXD和RXD加上手头上刚好有一个usb to ttl。

Mac OS Usb TTL驱动

驱动下载地址: PL2303 Mac OS X Driver Download

如果不是对最新版本有强迫症的话,

安装文件: md_PL2303_MacOSX-10.6up_v1.5.1.zip

安装完后重启系统

mac os 安装screen

这里用到的串口工作是screen

 brew install screen

或者

 sudo port install screen

然后连接Raspberry Pi

可参考这篇文章 RPi Serial Connection

Raspberry PI串口通信

接着把我们TTL板子上的

GND->Groud

RXD->GPIO 14(TXD)

TXD->GPIO 15(RXD)

!注意:TXD连接的是RXD,不要接成一样的

Mac OS ttl 设置 raspberry pi

进行串口通讯

screen /dev/tty.usbserial 115200

接着我们就可以看到系统启动了，要我们输入用户名和密码

Raspbian GNU/Linux 7 raspberrypi ttyAMA0

raspberrypi login: pi
Password:
Last login: Sat Apr 26 05:58:07 UTC 2014 on ttyAMA0
Linux raspberrypi 3.10.25+ #622 PREEMPT Fri Jan 3 18:41:00 GMT 2014 armv6l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
ls

NOTICE: the software on this Raspberry Pi has not been fully configured. Please run 'sudo raspi-config'

然后

 sudo raspi-config

选择第一个，下面就可以继续了

 Expand Filesystem              Ensures that all of the SD card s

重启完，目测好像新版的raspberry pi带有openssh-server