Hello,
In S32DS/S32K_SDK installation folder you can find startup routines, linker files and header files for S32K14x devices. These are located at:
<S32DS_ARM_v2.0>\S32DS\S32SDK_S32K14x_EAR_0.8.4\platform\devices.
Attached you can also find the files related to GHS. Hope these help!
Regards,
Isaac