In G28M SOM, Micro SD and Wi-Fi/BT are multiplexed with the same pins and so either Micro SD or Wi-Fi/BT is only supported. In the part number iW-G28D-SM20, only Wi-Fi/BT is supported and Micro SD is not supported.
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Please find the detailed product information here:
Zynq™ 7000 SoC SODIMM System on Module