CONFIG_MPC836x_MDS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
Freescale MPC836x MDS
modulename: mpc836x_mds.ko
configname: CONFIG_MPC836x_MDS
Linux Kernel Configuration
└─>83xx-based boards
└─>Freescale MPC836x MDS
In linux kernel since version 2.6.21 (release Date: 2007-04-25)
This option enables support for the MPC836x MDS Processor Board.