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

[Raschen Josef]

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?

Thanks,
Josef