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  1. Hello, I use the NanoPi Neo (4.19.38-sunxi, Armbian #5.85 ) to pool an external device over /dev/ttyS1 serial port. At flashing moment of the external device, I should switch pins of ttyS1 to input mode by using bash commands #!/bin/bash firmware=`ls update_*.hex` echo "198" > /sys/class/gpio/export echo "199" > /sys/class/gpio/export echo "in" > /sys/class/gpio/gpio198/direction echo "in" > /sys/class/gpio/gpio199/direction # device update flash -P linuxgpio -b 40000 $firmware echo "198" > /sys/class/gpio/unexport echo "199" > /sys/class/gpio/unexport Is it possible to change up the mode of pins to the alternate function (ALT5) without the rebooting the OS?