[U-Boot] Loading kernel from SD card slow on MinnowBoard Turbot since v2016.09

[Raschen Josef]

> I think this is related with below commit...

> commit 6dffdbc3a5911e768be21850a612bfb4871a23ef
> Author: Wenyou Yang <wenyou.yang at atmel.com>
> Date:   Sun Sep 18 09:01:22 2016 +0800
>
>    mmc: sdhci: Add the programmable clock mode support
>
>    Add the programmable clock mode for the clock generator.
>
>     Signed-off-by: Wenyou Yang <wenyou.yang at atmel.com>
>
> I'm checking with SD3.0..If this patch cause this issue..i will fix it.

>From my tests it should be somewhere between these two commits:
1c62d999528da1f052cb4b07cbb540b148c52537    OK
ceec08f50b66df0c988033842ec057a32658cfe0    NOK

>
> Best Regards,
> Jaehoon Chung

Thanks,
Josef