Raspberry Pi with USB2Serial

Problem: Everytime when i connect a USB2Serial converter (PL2303) to my RaspberryPi it will crash the RaspberryPi.
Workaround: i had to plug in the USB2Serial converter first before powering up RaspberryPi. root@raspberrypi:~# /opt/vc/bin/vcgencmd version Feb 7 2013 16:46:17 Copyright (c) 2012 Broadcom version 367974 (release) root@raspberrypi:~# uname -a Linux raspberrypi 3.6.11+ #371 PREEMPT Thu Feb 7 16:31:35 GMT 2013 armv6l GNU/Linux root@raspberrypi:~# cat /boot/cmdline.txt dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

[    3.212148] usb 1-1.2: new full-speed USB device number 4 using dwc_otg
[    3.333458] usb 1-1.2: New USB device found, idVendor=07aa, idProduct=002a
[    3.360639] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    3.670429] udevd[142]: starting version 175
[    4.802936] Registered led device: led0
[    4.909087] usbcore: registered new interface driver usbserial
[    5.020630] usbcore: registered new interface driver usbserial_generic
[    5.451993] usbserial: USB Serial Driver core
[    5.606954] usbcore: registered new interface driver pl2303
[    5.872021] pl2303 1-1.2:1.0: pl2303 converter detected
[    5.957278] usb 1-1.2: pl2303 converter now attached to ttyUSB0

(1) Setting up minicom
(1.1) Disable console ttyAMA0
(1.2) Disable boot info
(1.3) Reboot for changes to take effect
(1.4) Install minicom root@raspberrypi:~# grep ttyAMA0 /etc/inittab #T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100 [BEFORE] root@raspberrypi:~# cat /boot/cmdline.txt dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait [AFTER] root@raspberrypi:~# cat /boot/cmdline.txt dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait root@raspberrypi:~# apt-get install minicom Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: lrzsz The following NEW packages will be installed: lrzsz minicom 0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 420 kB of archives. After this operation, 1,189 kB of additional disk space will be used. Do you want to continue [Y/n]? y Get:1 http://mirrordirector.raspbian.org/raspbian/ wheezy/main lrzsz armhf 0.12.21-5 [106 kB] Get:2 http://mirrordirector.raspbian.org/raspbian/ wheezy/main minicom armhf 2.6.1-1 [314 kB] Fetched 420 kB in 1s (279 kB/s) Selecting previously unselected package lrzsz. (Reading database ... 59216 files and directories currently installed.) Unpacking lrzsz (from .../lrzsz_0.12.21-5_armhf.deb) ... Selecting previously unselected package minicom. Unpacking minicom (from .../minicom_2.6.1-1_armhf.deb) ... Processing triggers for man-db ... Processing triggers for menu ... Setting up lrzsz (0.12.21-5) ... Setting up minicom (2.6.1-1) ... Processing triggers for menu ... root@raspberrypi:~# # Connected rollover cable to console port on Cisco switch and serial port of laptop. # $ minicom -s # selected "Serial port setup" # set serial device to /dev/ttyUSB0 # set BPS/Par/Bits to 9600 8N1 # set hardware and software flow control to "no" # selected "save setup as dfl" # slected "exit from minicom" # restarted minicom using "$ minicom" # hit enter, space, etc. a bunch of times after the modem finishes initializing to try and wake up the connection. # I was able to login to my Cisco1700 router