Radim 
Hi all! I have a problem with onboard buttons. I have a directory "/sys/devices/platform/gpio-keys/input", but i have not /dev/buttons. A test use "echo 195 > /sys/class/gpio/export", but result is "echo: write error: Device or resource busy". Can anybody help me? ( mapping via memmap is worked, but it is not right for me..) Thanks Radim