I am using the mainline linux kernel-3.4.50 built with mxs_defconfig. Based on the sysfs I am trying to init and use a GPIO as interrupt. Unfortunately the complete systems hangs when the interrupt is triggered.
For test I have connected PIO 6 and PIO 27 in hardware. PIO 27 should be act as output to trigger PIO 6 that is configured as interrupt input. On the shell I am using the commands below:
# cd /sys/class/gpio
# echo 6 >export
# echo 27 >export
# echo out >gpio27/direction
# echo in >gpio6/direction
# echo rising >gpio6/edge
# echo 1 >gpio27/value
------- from here there is no return. It seems as the complete system hangs, since it is not reachable anymore over TCP/IP (ping).
Does anyone has an idea what is going wrong here?