UART2 enable
CONFIG_UART2_ENABLE
  Say Y here to enable UART2, or the secondary UART. This UART can be
  used to connect a second console (uClinux) or to control external
  equipment.

UART2 FIFO
CONFIG_UA2_FIFO1
  The UART has configurable transmitt and receive FIFO's, which can
  be set to 1 - 32 bytes. Use 1 for minimum area, or 8 - 32 for
  maximum throughput.

