MANTIS_UART_CTL
mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);