CONFIG_MACH_PCM038 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Phytec phyCORE-i.MX27 CPU module (pcm038)

modulename: pcm038.ko

and/or

mach-pcm038.ko

configname: CONFIG_MACH_PCM038

Linux Kernel Configuration
└─>Phytec phyCORE-i.MX27 CPU module (pcm038)
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Include support for phyCORE-i.MX27 (aka pcm038) platform. This
includes specific configurations for the module and its peripherals.

source code:
arch/arm/mach-mx2/pcm038.c