Hello George,
My question is how do I switch from 3.3V to 1.8V, is there a dedicated GPIO? or could I use GPIO_SD_B1_07 to switch supply to the eMMC.
This is controlled by the supply voltage you apply to NVCC_SD1. You can refer to Table 7 of the datasheet to get more information about it. Just as heads-up, this is the voltage domain for other signals too, so if you supply 1.8 might affect the signals of other modules.
I see a boot option to boot from 1.8V on uSDHC 1 but I don't see a similar option for uSDHC 2 in both the HW design guidelines and the schematic.
Could you please specify where did you see this option? If you refer to Table 8-20 of the reference manual, you will see that you can select 1.8V for the USDHC2 interface too.
Have a great day,
Victor
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