In G36M SoM, by default the PS_MODE[0:2] pins are pulled up with 1 kΩ resistors on the SOM.
The Zynq MPSoC SOM supports multiple boot devices, including eMMC, Quad SPI, SD1, and JTAG.
The boot device is selected through the boot mode pins, which are configured using the Boot Selection Switch. Please refer section “Boot Mode Switch” from the G36 Devkit datasheet for more details.
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Please find the detailed G36M/G36D product information in the below link,