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am3354 使用linux-4.9.28版本中 启动内核时GPMC_AD12输出电平的问题

你好,我在Uboot中将gpmc_ad12复用成gpio并输出高电平,Uboot加载内核后,运行到”Starting kernel ...  “时就会将gpmc_ad12的电平拉低,请问在修改哪里的内核参数,可以避免在启动linux内核时拉低gpmc_ad12的电平,谢谢!