Re: UART misbehaves under Linkstation/KuroBoxHG

[Oncaphillis <oncaphillis@snafu.de>]

Guennadi Liakhovetski wrote:
> On Wed, 8 Aug 2007, Oncaphillis wrote:
>
> >  So that's ok ? No misconfiguration ? And that setserial tells
> >  me the port is 0x000 ?
>
> Yes, everything looks ok, don't know why, setserial reports 0 here too, 
> but it doesn't cause me any (visible) problems.
>
> >  I thought the dts file which
> >  comes with the linkstation kernel describes the ports and IRQs
> >  but poking there didn't change anything. It seems like the kernel
> >  is ignoring the serial settings in the dts-file (which I do not
> >  realy understand) all together.
>
> Believe me, it doesn't ignore them:-) Don't know what exactly you were 
> poking at there, but it should be quite easy to break it by changing 
> clocks / address / irq...
>
> >   I started with a debian distro
> >   http://www.kurobox.com/mwiki/index.php/Debian_sylver
> >
> >   Hmm I tried my very best to eliminate this everywhere. Actually I
> >   resurrected the ARV00 device by creating a soft link to a ttySx
> >   with during bootup within the udev filesystem.
> >
> >   <snip>
> >         if [ ! -e /dev/AVR00 ];then
> >          cat /proc/tty/driver/serial | grep 80004500 | grep -q 0:
> >            && AVR=/dev/ttyS0 || AVR=/dev/ttyS1
> >          echo "Making AVR00 link to "$AVR;
> >          ln -s $AVR /dev/AVR00
> >         fi;
> >   </snip>
> >
> > Stole the trick from the avr_evtd startup script...
>
> Well, just do "ls -l /dev/AVR00", then "lsof /dev/ttyS0".

  Oh.... that's something I should have thought about (shaking my
  head)

  I hope I found the the misconfigured part. I didn't look
  at /etc/inittab. It opens a getty on /dev/ttyS0. That
  might do the trick. Have to recompile my kernel right now with
  standard config to check this out.

> In principle, as mentioned elsewhere before, you don't need any daemons on 
> linkstation/kurobox now for "basic" operation, i.e., the kernel disables 
> the watchdog on startup, and properly sends reboot and power-off commands 
> to the AVR itself without any userspace support. So, at least for a test, 
> you could stop all those daemons. You need them though if you want to use 
> the buttons to power down / reboot / whatever, do other fancy things with 
> the AVR...

  Well ... it doesn't seem to need the daemons but at least
  the kuro_boot  script or something similar has to be executed
  once sending the right init strings to the AVR or your system
  reboots after a few minutes at least on my box.

> Another possible reason why, for example, your stty misbehaves, maybe it 
> is somehow broken in that distro? I am just using etch and things work 
> pretty well.
>
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski

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