CONFIG_MPC837x_MDS is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
Freescale MPC837x MDS
modulename: mpc837x_mds.ko
configname: CONFIG_MPC837x_MDS
Linux Kernel Configuration
└─>83xx Board Type
└─>Freescale MPC837x MDS
In linux kernel since version 2.6.25 (release Date: 2008-04-16)
This option enables support for the MPC837x MDS Processor Board.