@balbes150 I don't know much about RK and AML, but on AW most, if not all, SoCs have 3 mmc ports. SD card is always connected on first one, wifi SDIO module on second and eMMC on third. I guess that U-Boot enumerates devices in port order, so that would mean that SD card is always first device. However, another explanation would be that first device is one which you booted from - did you check that?