CONFIG_MN10300_TTYSM is not available for thedefaultarchitecture x86.
Result is shown for architecture mn10300

Support for ttySM serial ports

modulename: mn10300-serial.ko

configname: CONFIG_MN10300_TTYSM

Matsushita MN10300/AM33 Kernel Configuration
└─>Matsushita MN10300 system setup
└─>MN10300 internal serial options
└─>Support for ttySM serial ports
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option enables support for the on-chip serial ports that the
MN10300 has available.

source code: