CONFIG_ETRAX_RS485 is not available for thedefaultarchitecture x86.
Result is shown for architecture cris
RS-485 support
configname: CONFIG_ETRAX_RS485
Linux Kernel Configuration
└─>RS-485 support
In linux kernel since version 2.6.12
Enables support for RS-485 serial communication. For a primer on
RS-485, see <http://en.wikipedia.org/wiki/Rs485>
RS-485, see <http://en.wikipedia.org/wiki/Rs485>