CONFIG_OMAP_SERIAL_WAKE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Enable wake-up events for serial ports


Linux Kernel Configuration
└─>TI OMAP Common Features
└─>Enable wake-up events for serial ports
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Select this option if you want to have your system wake up
to data on the serial RX line. This allows you to wake the
system from serial console.