imx6q boot from sd card failed

[liu_jialu]

u-boot, imx6q boot from sd card failed, i configured the DCD file, and modified the Card Detect Pin， but still can't get anything for UART1, console displayed nothing.

what else can i check, thanks.

[joanxie]

could you tell me how did you modify the Card Detect Pin? and pls refer to the mx6q board schematic to check if your hardware is correct or not

[liu_jialu]

I used pin:SD3_RST for Card Detect，yocto u-boot source code modified like this：

diff --git a/board/freescale/mx6sabresd/mx6sabresd.c b/board/freescale/mx6sabresd/mx6sabresd.c
index 6ef5131..21ca89b 100644
--- a/board/freescale/mx6sabresd/mx6sabresd.c
+++ b/board/freescale/mx6sabresd/mx6sabresd.c
@@ -154,7 +154,8 @@ static iomux_v3_cfg_t const usdhc3_pads[] = {
        MX6_PAD_SD3_DAT5__SD3_DATA5 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT6__SD3_DATA6 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
        MX6_PAD_SD3_DAT7__SD3_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
-       MX6_PAD_NANDF_D0__GPIO2_IO00    | MUX_PAD_CTRL(NO_PAD_CTRL), /* CD */
+//     MX6_PAD_NANDF_D0__GPIO2_IO00    | MUX_PAD_CTRL(NO_PAD_CTRL), /* CD */
+       MX6_PAD_SD3_RST__GPIO7_IO08 | MUX_PAD_CTRL(NO_PAD_CTRL), /* CD */
 };
 
 static iomux_v3_cfg_t const usdhc4_pads[] = {
@@ -347,7 +348,8 @@ int mmc_map_to_kernel_blk(int dev_no)
 }
 
 #define USDHC2_CD_GPIO IMX_GPIO_NR(2, 2)
-#define USDHC3_CD_GPIO IMX_GPIO_NR(2, 0)
+// #define USDHC3_CD_GPIO      IMX_GPIO_NR(2, 0)
+#define USDHC3_CD_GPIO IMX_GPIO_NR(7, 8)

[liu_jialu]

change

            MX6_PAD_SD3_RST__GPIO7_IO08 | MUX_PAD_CTRL(NO_PAD_CTRL),

to

            MX6_PAD_SD3_RST__GPIO7_IO08 | MUX_PAD_CTRL(USDHC_PAD_CTRL),

it works now.

thanks Joan, @ Joan Xie