[Soekris] net5501 and GPIO

[Ralph Becker-Szendy]

On Tue, 29 Jan 2008, Poul-Henning Kamp wrote:

> This is the first I hear about that, can you elaborate which pins
> you find unexpected places ?

If I had the detailed pinout information with me, I would have posted
it.  What I should have done is to post that I'll follow up tonight
with the correct listing.

If my vague memory is right, the pinout goes as follows:
- Pins 1 and 2 are some sort of power.
- From pins 3... on, it starts with GPIO16 and up.  The manual
   had some different number assignment for those.
- If you start at pin 3, there are at least 6 or 7 useable
   GPIO pins, followed by a ground pin right afterwards.
- I found more IO pins, plus the serial pins, further down the
   connector, in the expected places but again with the GPIO number
   assignment not exactly matching the 4801 manual.

This is good, because I needed only 5 GPIO pins, plus +5V and Gnd, and
I wanted to use the narrowest possible flat cable (a 20-wire cable
would have made routing around hard disk, MiniPCI card and RF antenna
wiring even harder).  The pinout provides this nicely.

All this was done with OpenBSD 4.1.  It might theoretically be possible
that other OSes assign the GPIO pins differently.

I will post the detailed pin listing tonight; it is stored both on a
file on the Soekris machine, and in my notebook, but both are an hour
by car away and not network accessible.

--
Ralph Becker-Szendy    ralph at lr.los-gatos.ca.us               (408)395-1435
735 Sunset Ridge Road; Los Gatos, CA 95033