Add /dev/soekris-errled device to control the Error-LED on Soekris cards/boxes.
Add /dev/soekris-errled device to control the Error-LED on Soekris cards/boxes.

    # turn LED off
    echo '0' > /dev/soekris-errled

    # turn LED on
    echo '1' > /dev/soekris-errled

    # flash LED (5 hz)
    echo 'f' > /dev/soekris-errled

    # flash LED (4/2 = 2 hz), syntax: "f[1-9]" -> .5 -> 4.5 Hz
    echo 'f4' > /dev/soekris-errled

    # flash digits 1,3 and 7, syntax: "d[1-9]*"
    echo 'd137' > /dev/soekris-errled

Characters not understood are ignored.

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