Micron MTFC2G is a 2G V4.41 eMMC chip.
sam-ba's sdmmc applet appears to be incompatible with a V4.41 eMMC like Micron's MTFC2G device which is not a "high capacity" device (I believe HC is defined as greater than 2G). The applet code determines the device capacity based on the SEC_COUNT field of the extended CSD register if the device version is greater than 4. According to the datasheet of the MTFC2G, this value is 0h. Instead the device size is defined by the C_SIZE field in the CSD register. Am I missing something or is this device truly incompatible?