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AM3505: Debugging GPMC

Part Number: AM3505

Customer using AM3505BZCNA and currently debugging a GPMC issue.  They have identified that they did not tie pin G20 and G21 to GND, and they will fix that in the next board spin.  What they want to know is the GPMC issue they are having related to pin G20 and G21 not being grounded (left unconnected) or do they need to do further investigation?  For example are pin G20 and G21 related to the GPMC I/Os or maybe the CORE/Peripheral logic?