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GPIO无法唤醒AM335



按照  AM335x Power Management Standby User's Guide

mkdir -p /debugfs
mount -t debugfs debugfs /debugfs
cd /debugfs/omap_mux/board/
echo gpmc_ad12.gpio1_12=0x27,rising > standby_gpio_pad_conf
echo gpmc_ad8.gpio0_22=0x27,falling>standby_gpio_pad_conf


echo standby > /sys/power/state

通过GPIO无法唤醒系统,通过串口0在控制台中输入任意东西可以唤醒,求解啊。是不是需要配置内核呢?具体应该怎么配置?