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am3358 gpmc 16bit nonmultiplexed nor device

Hello, I use the gpmc to connect the 16bit nor device. when I test it, I can use the out8() and in8() to read and write to it, but when I use the out16() and in16(), the problem crashed. I don't know why, I config the devicesize 16 in the GPMC_CONFIG1 register, can somebody help me? thanks!