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

[Bin Meng]

+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?

Regards,
Bin