What is the difference between SD and EMMC on setting？
The SD/MMC/eSD/eMMC/SDXC boot can be performed using the USDHC ports. The emmc support 4-bit and 8-bit data bus. For the 4-bit the emmc is the same design with the SD. The emmc design is almost the same as used in i.MX6 series use. Hope this can do help for you.
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