CONFIG_MPC85xx_MDS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
Freescale MPC85xx MDS
modulename: mpc85xx_mds.ko
configname: CONFIG_MPC85xx_MDS
Linux Kernel Configuration
└─>Freescale Book-E Machine Type
└─>Freescale MPC85xx MDS
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
This option enables support for the MPC85xx MDS board