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Library Retarget File and Low Level I/O Routines

I am reading the official Keil documents about

Library Target Files
http://www.keil.com/support/man/docs/gsac/gsac_retargetcortex.htm

and

Low Level I/O Routines.
www.keil.com/.../gsac_lowlevelroutinescortex.htm

Seemingly I need to implement both of these functions for my devices. However, I have no idea how to start. Can anybody point me to the right place?

I am probably looking for a lazy excuse, but I imagine there should be generic implemented files for popular devices and developers shouldn't have to write them again? If I am right, where can I find those files? I am using Freescale MKL05Z32VFM4, an ARM Cortex M0+ device, if it helps.

Thanks again for all of your help.