Soekris Stuff

I've recently been working with a Soekris net4826 under Linux. I had a hard time finding info about the GPIO on it, so I am putting some info about it up here.

In order to get it working, I did the following, using a vanilla 2.6.15.6 kernel:

modprobe scx200_gpio
mkdir /dev/soekris
cd /dev/soekris
mknod error_led c 254 20
mknod gpio0 c 254 13
mknod gpio1 c 254 12
mknod gpio2 c 254 0
mknod gpio3 c 254 2
mknod gpio4 c 254 3

The following will get a net4801 working under 2.6.18, assuming you have the needed modules built

modprobe pc8736x_gpio
modprobe scx200_gpio
mkdir /dev/soekris
cd /dev/soekris
mknod error_led c 253 20
mknod gpio0  c 254 16
mknod gpio1  c 254 17
mknod gpio2  c 254 18
mknod gpio3  c 254 19
mknod gpio4  c 254 20
mknod gpio5  c 254 21
mknod gpio6  c 254 22
mknod gpio7  c 254 23
mknod gpio8  c 254  4
mknod gpio9  c 254  5
mknod gpio10 c 254 11
mknod gpio11 c 254 10

scx200_gpio and pc8736x_gpio use a dynamic major number, so check dmesg to make sure you are using the right one.

Characters you can echo to the device:

0: Set the pin low
1: Set the pin high
O: Enable output on the pin
o: Disable output on the pin
T: Set pin output to push pull
t: Set pin output to open drain
P: Enable pull up on the pin
p: Disable pull up on the pin
v: printk the current pin settings

Reading a byte from the device will return 0 or 1 (in ascii) depending on if the pin is currently high or low.

Here's the pinout for JP3, pin 1 is marked on the board, and pin 2 is across from it:

pin no    function            SC1100 pin
  1        +3.3V
  2        +5V
  3        GPIO0 / I2C SDA  -> AB2D/GPIO13 (AD23)
  4        GPIO1 / I2C SCL  -> AB2C/GPIO12 (AE23)
  5        GPIO2            -> GPIO0 (B22)
  6        GPIO3            -> GPIO2 (B21)
  7        GPIO4            -> GPIO3 (A22)
  8        GND
<Previous  | Top |  Next>
©2009 Ryan Castellucci
Transparent dot