About the module Multiplexed GPIO
ConnectCore for i.MX51 Hardware Reference Manual
50
GPIO Mode Pad On module default as
GPIO4_2 ALT3 NANDF_D6 NANDF_D6
GPIO4_3 ALT3 NANDF_D5 NANDF_D5
GPIO4_4 ALT3 NANDF_D4 NANDF_D4
GPIO4_5 ALT3 NANDF_D3 NANDF_D3
GPIO4_6 ALT3 NANDF_D0 NANDF_D0
GPIO4_7 ALT3 NANDF_D1 NANDF_D1
GPIO4_8 ALT3 NANDF_D0 NANDF_D0
GPIO4_9 ALT3 CSI2_D12 CSI2_D12
GPIO4_10 ALT3 CSI2_D13 CSI2_D13
GPIO4_11 ALT3 CSI2_D18 CSI2_D18
GPIO4_12 ALT3 CSI2_D19 CSI2_D19
GPIO4_13 ALT3 CSI2_VSYNC CSI2_VSYNC
GPIO4_14 ALT3 CSI2_HSYNC CSI2_HSYNC
GPIO4_15 ALT3 CSI2_PIXCLK CSI2_PIXCLK
GPIO4_16 ALT3 I2C1_CLK GPIO
GPIO4_17 ALT3 I2C1_DAT GPIO
GPIO4_18 ALT3 AUD3_BB_TXD AUD3_BB_TXD
GPIO4_19 ALT3 AUD3_BB_RXD AUD3_BB_RXD
GPIO4_20 ALT3 AUD3_BB_CK AUD3_BB_CK
GPIO4_21 ALT3 AUD3_BB_FS AUD3_BB_FS
GPIO4_22 ALT3 CSPI1_MOSI CSPI1_MOSI
GPIO4_23 ALT3 CSPI1_MISO CSPI1_MISO
GPIO4_24 ALT3 CSPI1_SS0 CSPI1_SS0 (MC13892 Chip select)
GPIO4_25 ALT3 CSPI1_SS1 CSPI1_SS1
GPIO4_26 ALT3 CSPI1_RDY LCD SPI chip select
GPIO4_27 ALT3 CSPI1_SCLK CSPI1_SCLK
GPIO4_28 ALT3 UART1_RXD UART1_RXD
GPIO4_29 ALT3 UART1_TXD UART1_TXD
GPIO4_30 ALT3 UART1_RTS UART1_RTS
GPIO4_31 ALT3 UART1_CTS UART1_CTS
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