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EXP0 connector pin assignments doesn't match on the AM335x baseboard and daughterboard schematic.

Why the pin assignments on the  expansion connector EXP0 of AM335x ZCZ baseboard are different from the EXP0 on the daughterboard, while all other expansion connectors (EXP1~EXP3) are the same ? There are "no-connect" on even pin #4~#22  in the baseboard schematic , but all these pins are "RMII1_xxx" and "spi_cs0" in the daughterboard schematic.  I checked bothbaseboard schematic rev1.5c and rev1.2a,  both revisions have the same issue. Thanks in advance for any answer.

Regards

Eric