Use emdebian source list.

Simply add this source list (you might want to change your suite name) :

/etc/apt/sources.list.d/emdebian.list

# 
# -- Emdebian sources.list entries
# 
deb http://www.emdebian.org/debian/ wheezy main

and install gcc-4.4-arm-linux-gnueabi :

$ sudo apt-get update
$ sudo apt-get install gcc-4.4-arm-linux-gnueabi

TODO AFAIK cross compile packages are available directly from ubuntu, I just don't remember package names

TODO document code-sourcery tarball install