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Can a UHS-II class SD card with 8-bit data bus and 1.8V signaling be used with the CM4 lite?

The CM4IO board clearly only connects 4 data lines and 3.3V to the SDcard socket, but could this be achieved with a custom carrier board?

I suspect that this would be equivalent to connecting an 8-lane eMMC chip as is done with the on-board eMMC versions of the CM4. Could this achieve speeds similar to what the onboard eMMC can do?

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