sd

用非高速卡（不带HC字样的），使用是完全没问题的，最高速度有16M/s。但是高速卡（有high capacity）的就出现如下错误：
[  193.887832] mmc1: Timeout waiting for hardware interrupt.
[  193.894750] mmcblk1: error -110 sending stop command, original cmd response 0x2000900, card status 0x2400900
[  193.904770] mmcblk1: error -110 transferring data, sector 0, nr 8, cmd response 0x2000900, card status 0x0
[  193.914979] mmcblk1: retrying using single block read
[  203.927833] mmc1: Timeout waiting for hardware interrupt.
[  203.935599] mmcblk1: error -110 transferring data, sector 0, nr 8, cmd response 0x2000900, card status 0x0
[  203.945317] end_request: I/O error, dev mmcblk1, sector 0
[  213.967814] mmc1: Timeout waiting for hardware interrupt.
[  213.973644] mmcblk1: error -110 transferring data, sector 1, nr 7, cmd response 0x2000900, card status 0x0
[  213.983381] end_request: I/O error, dev mmcblk1, sector 1
[  224.007851] mmc1: Timeout waiting for hardware interrupt.

 

///////////////////////////////////////////////////////////////////
arch/arm/boot/dts/imx6qdl-sabresd.dtsi

&usdhc2 {
 pinctrl-names = "default";
 pinctrl-0 = <&pinctrl_usdhc2>;
 bus-width = <8>;
 cd-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>;
 wp-gpios = <&gpio2 3 GPIO_ACTIVE_HIGH>;
 no-1-8-v;
 keep-power-in-suspend;
 enable-sdio-wakeup;
 status = "okay";
};

  pinctrl_usdhc2: usdhc2grp {
   fsl,pins = <
    MX6QDL_PAD_SD2_CMD__SD2_CMD  0x17059
    MX6QDL_PAD_SD2_CLK__SD2_CLK  0x10059
    MX6QDL_PAD_SD2_DAT0__SD2_DATA0  0x17059
    MX6QDL_PAD_SD2_DAT1__SD2_DATA1  0x17059
    MX6QDL_PAD_SD2_DAT2__SD2_DATA2  0x17059
    MX6QDL_PAD_SD2_DAT3__SD2_DATA3  0x17059
    MX6QDL_PAD_NANDF_D4__SD2_DATA4  0x17059
    MX6QDL_PAD_NANDF_D5__SD2_DATA5  0x17059
    MX6QDL_PAD_NANDF_D6__SD2_DATA6  0x17059
    MX6QDL_PAD_NANDF_D7__SD2_DATA7  0x17059
   >;
  };