Re: ttyS0 problem in kernel 2.6.17 and 2.6.20.

Frederico,
I think the problem is actually somewhere in the power management code. 
I tried to build my own serial cable yesterday and while diagnosing it, 
I discovered that the 3.3V output on Pin 11 of the I/O connector was not 
working. I  just booted into the maintainance (OK+Cancel) screen, and 
the 3.3V works again. The reason for your serial problems is that the 
cable has internal components that are powered from this 3.3V output.

Federico Ruiz wrote:
> Hi list!
>
> I managed to get openzaurus-3.5.5 + kernel 2.6.20 running in my
> poodle. Everything I usually use is working (opie+ratoc CFU1.1 usb
> host controller + usb devices, and a lot of programs). But there is an
> exception: ttyS0 serial console. With kernel 2.4.18 I was using the
> serial console plus a particular cable
> (http://serialio.com/products/adaptors/ZThinCable.php) to connect the
> zaurus to a gps receiver (rs232). gpsd worked fine with that
> configuration. Even I was able to use minicom to get some strings out
> of the gps.
> Now in kernel 2.6.20 (or 2.6.17) I don't get anything from the serial
> port. There are no kernel errors or nothing. The problem is that I
> don't receive any data from the serial port.
>  I used minicom to try to comunicate to my gps. I configured all the
> serial port settings (hardware and software flow control off, baud
> rate, etc) in the right way.
>  I also play around with stty with no luck.
> If I flash back my zaurus to any openzaurus with kernel 2.4 the
> communication starts to work again.
> I think there is a connection with this problem in here:
> http://sourceforge.net/mailarchive/message.php?msg_id=45BCA447.7050502%40alumni.cse.cuhk.edu.hk
> but not sure.
> Is this a bug of the PXA serial driver in the kernel? (it looks like)
> Anybody else with the same problem?
> Any ideas what could be wrong?
>
> PS: I disabled the ttyS0 console connection in the inittab and then
> init q to reload the new configuration.
>
> Regards,
> Federico Ruiz.
>
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