[Soekris] GPIO support for the net-4801 on Linux

[Arnau Sanchez]

Hi Jan,

> i was playing a bit with that COM port. It it`s not a COM2 TTL , it is 
> only
> TTL of COM1 it means that you can use DB-9 connector to use COM1 with 
> RS232 bus
> driver or plug your device directly to TTL input of COM1. So there are 
> only two
> serial ports COM0 COM1. I case of using TTL levels the driver chip 
> MAX??? is
> disabled (i thing).


Wow, that's a surprise. From the manual:

http://www.soekris.com/Manuals/net4801_manual.pdf

"3.5 JP5, User I/O
20 pins 0.050" header with 12 programmable general purpose input/output
ins and com2 serial port access at TTL level"

and

"3.9    JP4, COM2
10 pins 0.050" header for serial port COM2. Can be connected to a DB9
using a defacto standard cable assembly"

As the external COM1 is normally used for emergency logins, I would
prefer to use another serial port...

regards
arnau