Hi,
Check out the free ColdFire_LITE_TCPIP software stack available from Freescale at
www.freescale.com/coldfire. This TCP/IP stack is provided free of charge, and in source code that can be built using CodeWarrior for ColdFire v6.4. This is a great place to start for the MCF5223x family of MCUs with in 10/100BaseT Ethernet Interface with built in MAC & Phy.
There is also a ROM monitor called dBUG available at no charge in source code from Freescale. Look for M5223EVB_DBUG.ZIP using the search engine on the Freescale site.
There are also operating systems available for this MCU family, including uTasker (
www.uTasker.com), among others.
Thanks,
Rick