[U-Boot] Question about baud rate

[Detlev Zundel]

Hi Dan,

>> Why doe you want to setup this parameters "from the outside"?  Really
>> only the serial device used for a console needs to be setup by
>> firmware.  All other serial devices should be initialized by the user
>> space programs using them.
>
> I would like my startup script to cat messages to ttyS1, as well as to
> the console (ttyS0). Basically for the purpose of informing users that
> the firmware cannot execute for some reason (we don't like to give
> access to the console). I was trying to avoid including stty or
> setserial, but if this is the accepted way to configure the serial
> port it's not a big deal ;-)

Personally I believe that every software task should setup as much as
possible from what it knows to be needed for its own work.  For a serial
program this includes setting the baud rate and the communications
parameter like 8/n/1.

>>> For each of the three uarts, the device tree has the following line:
>>>
>>> current-speed = <0>; /* Filled in by U-Boot */
>>
>> Checking current U-Boot code, I believe this comment is simply
>> wrong. I
>> cannot see any part in the canyonlands / or generic 4xx
>> infrastructure
>> that fixes up these properties.  Maybe Stefan can comment on this
>> though.
>>
>
> Interesting...I also tried manually entering a value here, but it
> didn't seem to have any effect. Maybe it just isn't used?

This may very well be the case.  An answer can probably be found on the
linux ppc mailing list[1] ;)

>>> Sorry for the silly question!
>>
>> I don;t think its a silly question, but I also think that you do not
>> need the configuration ;)
>>
>> Cheers
>>   Detlev
>
> Thanks for your response!

You're welcome!
  Detlev

[1] http://dir.gmane.org/gmane.linux.ports.ppc64.devel
    "PowerPC developers ML" <linuxppc-dev at ozlabs.org>

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