查看i.mx258手册中,查看到下面这段,是不是配置FEC_MDC 为mode ALT1,必须得配置IOMUXC_ESDHC2_IPP_CMD_IN_SELECT_INPUT 这个寄存器
NOTE: Pad FEC_MDC is involved in Daisy Chain.
- Config Register
IOMUXC_AUDMUX_P4_INPUT_DB_AMX_SELECT_INPUT for
mode ALT2.
- Config Register
IOMUXC_ESDHC2_IPP_CMD_IN_SELECT_INPUT for mode ALT1. |