mmc over SPI on DM6467 based board. card not detected.

[Steve Chen]

On Sat, Aug 28, 2010 at 8:26 AM, Sumesh Kaana <sumeshkkn at hotmail.com> wrote:
> Hi all,
>
>
>
> I am trying to mount SD-Card over SPI on our custom DM6467 board. davinci
> spi controller driver and mmc over spi drver are selected in the menuconfig.
> i am using davinci-PSP.03-XX-00-37 kernel.
>
> I have also edited board initialization file to probe the MMC card under SPI
> as below:
>
>
>
> static struct spi_board_info dm646x_spi_info[] __initconst = {
>
> #ifdef CONFIG_MMC_SPI
>
>         {
>
>                 .modalias = "mmc_spi",
>
>                 .max_speed_hz = (750 * 1000 ),     /* max spi clock (SCK)
> speed in HZ */
>
>                 .bus_num = 0,
>
>                 .chip_select = 0,                       /* CS0 */
>
>                 .mode           = SPI_MODE_0,
>
>         },
>
> #endif
>
>
>
> The kernel boots with following log
>
...
> mmc0: Minimum clock frequency too high for identification mode
...

Have you tried lower the clock frequency?

Steve