From: Steven Scholz <steven.scholz@imc-berlin•de>
To: Lokesh Kumar <kumar.lokesh@wrx-us•com>
Cc: "'linuxppc-embedded@lists•linuxppc.org'"
<linuxppc-embedded@lists•linuxppc.org>
Subject: Re: mpc8xx memory mapped 16550A uart garbage
Date: Wed, 15 Oct 2003 16:21:42 +0200 [thread overview]
Message-ID: <3F8D57F6.6020708@imc-berlin.de> (raw)
In-Reply-To: <3439AB3A99ECD5409F3A52ACF814744D158DA0@norcom2.norcom.net>
Lokesh Kumar wrote:
> Hi,
> I got the serial.c from DENX linuxppc_2.4._devel tree which has support for
> 16550A as memory mapped uart, and am using it as a module. I made
> modifications to match my board. When I start it, it correctly recognizes
> that I have a 16550A and at correct IRQ. However, when I open and send
> something through the port (I just do cat>/dev/ttySe0), I get garbage on the
> other side. My 16550 has a crystal of 3.6864MHz and the processor runs at
> 49MHz. I thought that this kind of garbage problem is generally due to baud
> rate not set correctly. I see the divisor correctly calculated as
> 3686400/16/9600 = 24 and being sent to 16550. What else could I be doing
> wrong?
Did you verify the baudrate using a scope to measure the bittime?
Steven
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-10-15 14:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-15 13:42 mpc8xx memory mapped 16550A uart garbage Lokesh Kumar
2003-10-15 14:21 ` Steven Scholz [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-10-15 20:34 Lokesh Kumar
2003-10-16 7:08 ` Steven Scholz
2003-10-16 20:14 Lokesh Kumar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3F8D57F6.6020708@imc-berlin.de \
--to=steven.scholz@imc-berlin$(echo .)de \
--cc=kumar.lokesh@wrx-us$(echo .)com \
--cc=linuxppc-embedded@lists$(echo .)linuxppc.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox