CONFIG_PPC_PRPMC2800 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
Motorola-PrPMC2800
modulename: prpmc2800.ko
configname: CONFIG_PPC_PRPMC2800
Linux Kernel Configuration
└─>Motorola-PrPMC2800
In linux kernel since version 2.6.22 (release Date: 2007-07-08)
This option enables support for the Motorola PrPMC2800 board