UART1 enable
CONFIG_UART1_ENABLE
  Say Y here to enable UART1, or the console UART. This is needed to
  get any print-out from LEON3 systems regardless of operating system.

UART1 FIFO
CONFIG_UA1_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.


