[meta-freescale] imx6ul evk SD card boot issue with certain type of uSD

[Cjb_SW Freescale]

Dear All,
I'm facing a problem at boot (spl) with some types of uSD.

I made some tests, here is the result:

*uSD card Innodisk Industrial 2GB FAIL with:*
*uSD card Sandisk 8GB FAIL with:*
   U-Boot SPL 2016.03+fslc+g1e82446 (May 17 2016 - 12:24:33)
   Trying to boot from MMC
   spl: mmc block read error
   SPL: failed to boot from all boot devices
   ### ERROR ### Please RESET the board ###

*uSD card Sandisk 4GB Boot ok...*

Does anybody knows what is going wrong?
I'm aligned to fsl-bsp branch Krogoth

Thanks a lot
Simone
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