On Version 2.1 of the toolchain I accessed the emmc by /dev/mmcblk0. I can't find that device anymore.
eMMC support was not tested in fsimx6-V3.0, yet. But we have done it in the meantime. Please try the attached patch.
Go to the top directory of the Linux tree and issue the following command
This also removes the comment before the EMMC define in efusa9q.dts and efusa9dl.dts respectively. So if you are using your own main dts file, you have to apply the modification there,too.
Then rebuild your dtb file.
Your F&S Support Team