You should check the VDDSHVx voltages for the upper byte GPMC pins. Are you sure these pins are on a 3.3V voltage rail? Check Table 4-1 in the AM335X Datasheet to see which VDDSHVx rails supply the GPMC pins.
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You should check the VDDSHVx voltages for the upper byte GPMC pins. Are you sure these pins are on a 3.3V voltage rail? Check Table 4-1 in the AM335X Datasheet to see which VDDSHVx rails supply the GPMC pins.