AT91 / AT32 on-chip serial port support

modulename: atmel_serial.ko

configname: CONFIG_SERIAL_ATMEL

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>AT91 / AT32 on-chip serial port support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This enables the driver for the on-chip UARTs of the Atmel
AT91 and AT32 processors.

source code:
drivers/serial/atmel_serial.c