Guilig,
You shouldn't have to purchase anything, and Codewarrior is not required.
You could download the latest BSP from our website. I know a new one will come out later this summer with some more functionality, etc... But the current one is more than capable of doing application development.
The link to get the latest "offered" BSP..
is:
www.freescale.com/linuxThis gives you the main landing page for Freescale linux solutions (including third party links).
You can find the Coldfire BSPs by clicking on the left nav bar and selecting "Linux Software and Tools" then "BSPs for Coldfire."
The direct link is:
Coldfire_LinuxHope this helps.
-JWW