Hello John:
K22FN512 is part of the new Kinetis devices and unfortunately it will not be supported in CodeWarrior. Instead you can migrate to KDS (Kinetis Design Studio), or one of the other supported IDEs for Kinetis. You can check the different IDEs in the next link:
IDEs for Kinetis MCUs|Freescale
Regards!,
Jorge Gonzalez
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