PXA serial port support

modulename: pxa.ko

configname: CONFIG_SERIAL_PXA

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>PXA serial port support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you have a machine based on an Intel XScale PXA2xx CPU you
can enable its onboard serial ports by enabling this option.

source code: