on our custom board with i.MX6UL and eMMC 5.1, the bootloader doesn't recognize the eMMC.
The bootloader is loaded in serial download mode with the imx_usb_loader tool.
In uboot the following answers are shown:
mmc info => no card present
mmc dev 1 => Card did not respond to voltage select
The eMMC schematic is the same as in i.MX6UL EVK.
The u-boot is made with fsl-arm-yocto-bsp (mx6ul_14x14_evk).
Has u-boot to be modified working with eMMC 5.1?