CONFIG_MACH_PCM990_BASEBOARD is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

PHYTEC PCM-990 development board

modulename: pcm990-baseboard.ko

configname: CONFIG_MACH_PCM990_BASEBOARD

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>PHYTEC PCM-990 development board
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
source code:
arch/arm/mach-pxa/pcm990-baseboard.c
selects
CONFIG_HAVE_PWM