pads in i.MX8 QM MEK board dont work as expected

[nxf40256]

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

[art]

Please refer to the M4 core software examples, included into the MCUXpresso SDK for the i.MX8QM MEK board. The SDK can be configured and downloaded from here:

https://mcuxpresso.nxp.com/en/select

Best Regards,
Artur