We're using an eMMC Memory on the eSDHC4 Interface on an iMX6Q. We do notice Problems when writing and/or reading to/from eMMC Memory. We are using a dual voltage supported eMMC Memory (Micron 2NM400FDB311), where the VCCQ can be 3.3V (normal Operation) or 1.8V in low-power Operation. Our design (unfortunately) only supports the 3.3V for the VDDQ supply.
Now my question is: Does the iMX6 notices, that the VDDQ is only 3.3V or is the iMX6 Interface switching into low power mode and expects 1.8V levekls as well as outputting (writing) with 1.8V Levels?