RA4M2 UART RX interrupt not firing

Hello  Everyone, 

I have implemented  FREERTOS CLI using uart on RA4m2. actually i am  able to trasnmit using uart interface but unable to receive any command using uart.

I am facing to generate RX interrupt . here is my source code for uart call back function. It is an event based application using thready queue .  

Now the same source code using same call back function is working on RA6M3 controller but not on RA4M2. 

do i  need to specify something 

void cli_dbgUartCallback(uart_callback_args_t *p_args)
{
    Event_t event = { .id = EV_NO_EVENT, .payload.u32Arr[0] = 0 };
    m_dbgUartEvent = p_args->event;

    if ((UART_EVENT_RX_CHAR == m_dbgUartEvent) && (m_cmdInProgress == false))
    {
        if (m_bufferIndex < (CMD_BUFFER_SIZE - 1))
        {
            switch (p_args->data)
            {
                /* If Enter is pressed by user, send event to process the data */
                case '\r':
                {
                    /* Send command received event */
                    event.id = EV_DBG_UART_CMD_RCVD;
                    event.payload.u32Arr[0] = (uint32_t)&m_cmdBuffer[0];
                    evh_handleEvent(&event);
                    /* Set command in progress flag */
                    m_cmdInProgress = true;

                    /* Clear buffer index */
                    m_bufferIndex = 0;
                    break;
                }
                case '\b':
                {
                    /* Backspace was pressed.  Erase the last character in
                     * the input buffer
                     */
                    if (m_bufferIndex > 0)
                    {
                        m_bufferIndex--;
                        m_cmdBuffer[m_bufferIndex] = '\0';
                    }
                    break;
                }
                case '\n':
                    /* ignore \n escape */
                    break;
                default:
                {
                    /* Write RX data to input buffer */
                    m_cmdBuffer[m_bufferIndex++] = (char) p_args->data;
                    break;
                }
            }
        }
        else
        {
            /* Buffer overflow! */
            m_bufferIndex = 0;
        }
    }
}