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From: Detlev Zundel <dzu@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] Question about baud rate
Date: Thu, 17 Nov 2011 18:50:04 +0100	[thread overview]
Message-ID: <m2d3cqprjn.fsf@ohwell.denx.de> (raw)
In-Reply-To: <4947f7e5d3e49a62cc1a343077783a56@stevens.edu> (djantzen@stevens.edu's message of "Mon, 14 Nov 2011 12:55:51 -0500")

Hi Dan,

> I'm using a board similar to canyonlands with a ppc460ex. The baud rate 
> for ttyS0 is set to 115200 by the console= bootarg, but I'd also like to 
> set ttyS1-3 to 115200 also.

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.

> 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.

> How do I go about configuring u-boot to fill these with the baud rate I 
> choose?
>
> 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

-- 
One of the main causes of the fall of the Roman Empire was that, lacking zero,
they had no way to indicate successful termination of their C programs.
                                        -- Robert Firth
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de

  reply	other threads:[~2011-11-17 17:50 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-14 17:55 [U-Boot] Question about baud rate djantzen
2011-11-17 17:50 ` Detlev Zundel [this message]
2011-11-17 18:12   ` djantzen
2011-11-17 20:11     ` Detlev Zundel

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