Is it possible to share your schematic design here or by private message?
The scheme is the same as in the "Denebola" debug board.
On the debug board "Denebola", we notice the same behavior.
There it is possible to moving of the resistor to select the voltage level for the power supply of the MIPI unit of CX3.
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Once you change the power supply of 3.3v to 1.8v, the SPI read operation could not complete correctly and CX3 could not boot from that.