I want to know when NVCC_UART is set to 2.5V in imx6ul, can other NVCC_XXX be set to 3.3V, or can NVCC_XXX (NVCC_SD, NVCC_UART, NVCC_LCD, NVCC_GPIO) be set to different voltages separately?
Each NVCC_XXXX voltage can be set to a different voltage independently, within the Datasheet specifications. However, I would recommend that you use the i.MX Pins Tool (link below) to check your muxing options and voltage groups, as there may be conflicts on the voltage that feeds a module and the voltage of the Pad you will use to route the signal out.
I hope this helps!
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