I encountered some problems when using some pads in IMX8QM MEK board as below:
#define SC_P_USDHC2_DATA0 238 /*!< CONN.USDHC2.DATA0, DMA.UART4.RX, LSIO.GPIO5.IO26 */
#define SC_P_USDHC2_DATA1 239 /*!< CONN.USDHC2.DATA1, DMA.UART4.TX, LSIO.GPIO5.IO27 */
#define SC_P_USDHC2_DATA2 240 /*!< CONN.USDHC2.DATA2, DMA.UART4.CTS_B, LSIO.GPIO5.IO28 */
#define SC_P_USDHC2_DATA3 241 /*!< CONN.USDHC2.DATA3, DMA.UART4.RTS_B, LSIO.GPIO5.IO29 */
When i configured those pads to UART mode but there is no UART signal comes out
When i tried configuring those pads to GPIO (GPIO5), i couldn't control the signal either. I did not observe the signal change when set the out put value from 0 to 1 and vice versa.
Note that our application running on M4, and those pads are assigned to M4 partition, core A35 does not run, only core M4 is running