Letux Kernel


You are looking at an old revision of the page Devices-Overview. This revision was created by Nikolaus Schaller.

Table of Content

How to control Devices from user space (command line)


This page lists the most important devices and drivers that are specific to this board. And how they can be accessed from user space.

Touch Screen

is mapped to


pen down status can be read through

cat /sys/devices/virtual/gpio/gpio157/value


can be selected by adding defaultdisp="lcd" to the boot args

choose from user space by ???


can be selected by adding defaultdisp="dvi" to the boot args


can be selected by adding defaultdisp="venc" to the boot args


power on

echo "1" /sys/devices/virtual/gpio/gpio156/value

power off

echo "0" /sys/devices/virtual/gpio/gpio156/value

device file (use 9600 baud)

cat /dev/ttyS2

AUX and Power button