Linux tools are CWS-PPC-LLAPP-CX or CWS-PPC-LLAPP-LX for the Application Edition. These tools cover all the Linux-capable PowerPC products from Freescale, including 5200B. DevTech has just release v2.6 of these tools and they support the 5200 Rev B silicon.
For kernel development, consider the CWS-PPC-LLPLT-CX (node locked) or CWS-PPC-LLPLT-LX (float license) Platform Edition v2.6 or PCS tools (which are not specific to a processor family).
Finally, see http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=01272600612247 for informatoin about CWX-mGT-EX.
I'm told that, although Freescale does not officially support the Marvell DB64460-BP board, your CodeWarrior Embedded PowerPC 2.6 tools should have a configuration file for MPC7447A: