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

[Jaehoon Chung]

Hi

On 10/21/2016 04:40 PM, Jaehoon Chung wrote:
> Hi,
> 
> On 10/21/2016 03:32 PM, Bin Meng wrote:
>> +Simon, Stefan,
>>
>> On Fri, Oct 21, 2016 at 12:36 PM, Jaehoon Chung <jh80.chung at samsung.com> wrote:
>>> Hi,
>>>
>>> On 10/21/2016 01:27 AM, Raschen Josef wrote:
>>>> Hi,
>>>>
>>>> Reading a kernel image from an SD card via the fatload command on the MinnowBoard Turbot seems to be significantly slower since v2016.09 compared to v2016.07:
>>>>
>>>> v2016.07
>>>> => fatload mmc 1:1 ${loadaddr} bzImage ; zboot ${loadaddr}
>>>> reading bzImage
>>>> 5749232 bytes read in 129 ms (42.5 MiB/s)
>>>>
>>>> v2016.09
>>>> => fatload mmc 1:1 ${loadaddr} bzImage ; zboot ${loadaddr}
>>>> reading bzImage
>>>> 5749232 bytes read in 249 ms (22 MiB/s)
>>>>
>>>> The same for v2016.11-rc1.
>>>>
>>>> I am using U-Boot in bare mode on the board. Any idea what causes this?
>>>
>>> Could you share which driver you use?
>>>
>>
>> Could you bisect to see which commit introduced this regression?
> 
> I did..but i didn't see this issue on my boards. :(
> So as Bin's suggestion, could you try to bisect..?

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.

Best Regards,
Jaehoon Chung

> 
> Best Regards,
> Jaehoon Chung
> 
>>
>> Regards,
>> Bin
>>
>>
>>
> 
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