To get out of band management access to your raspberry pi a serial connection can be used. The raspberry pi provides per default a serial connection on some of the GPIO pins.
I just bought a USB to TTL to UART and used my netbook as a out of band management access via SSH and minicom.
- red = +5V
- black = ground
- white = TXD
- green = RXD
A look onto the system with the connected RS232 cable.
If necessary the Raspberry pi can be powered by the RS232. Just attach the red cable to pin 2 (just the first on the left in the second row on the picture)
A initial setup of minicom on a the raspberry pi or any other Debian / Ubuntu Linux shows if the RS232 connection works:
sudo aptitude install minicom <output ommited> sudo minicom -b 115200 -o -D/dev/ttyUSB0
If this works you can start get a permanent configuration for minicom
$useradd -G dialout your_user_name $sudo minicom -s raspberry
- Speed: 115200
- Bits: 8
- Parity: None
- Stop Bits: 1
- Flow Control: None