Hi,
According with section 27.2 "Driver Features" of the i.MX6 Linux Reference Manual (attached):
"The MMC driver supports the following features:
..• SD3.0 cards."
Also, information on link below may be useful:
Secure Digital - Wikipedia, the free encyclopedia
So, the card support is not dependent of the card capacity. If the card is v3.0 (SDXC UHS-I) it should be supported. If the card is v4.0 (SDXC UHS-II) it should be supported in SDXC UHS-I mode.
Hope this will be useful for you.
Best regards!
/Carlos
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