My board doesn't run on RS232C DTE mode.
I connect UART1_TXD to CSI0_DATA10(pad M1) and connect UART1_RXD to CSI0_DATA11(pad M3).
I also connect UART1_CTS to EI_D19(pad G21) and connect UART1_RTS to EIM_D20(pad G20).
I think that UART1_CTS is input signal, and UART1_RTS is output signal to i.mx6 on RS232C DTE mode.
Without flow control, my board runs normally.
I also set registers as below.
UART1_UFCR[DCEDTE]=1 (DTE mode selected)
IOMUXC_UART1_UART_RTS_B_SELECT_INPUT[DAISY]=00 (selecting ALT4 mode of pad EIM_D19 for UAET1_CTS_B)
IOMUX_SW_MUX_CTL_PAD_EIM_DATA19[MUX_MODE]=100 (select signal UART1_CTS_B)
IOMUX_SW_MUX_CTL_PAD_EIM_DATA20[MUX_MODE]=100 (Select signal UART1_RTS_B)
Are there any problems about my circuit connectons or register setting?