From: Phil Oester <kernel@linuxace.com>
To: Jan Engelhardt <jengelh@linux01.gwdg.de>,
Luca <kronos@kronoz.cjb.net>,
linux-kernel@vger.kernel.org
Subject: Re: Garbage on serial console after serial driver loads
Date: Sat, 26 Mar 2005 07:55:49 -0800 [thread overview]
Message-ID: <20050326155549.GA5881@linuxace.com> (raw)
In-Reply-To: <20050326151005.D12809@flint.arm.linux.org.uk>
On Sat, Mar 26, 2005 at 03:10:05PM +0000, Russell King wrote:
> Doesn't matter. The problem is that dwmw2's NS16550A patch (from ages
> ago) changes the prescaler setting for this device so we can use the
> higher speed baud rates. This means any programmed divisor (programmed
> at early serial console initialisation time) suddenly becomes wrong as
> soon as we fiddle with the prescaler during normal UART initialisation
> time.
FWIW, I see the same thing here on some Dell Poweredge boxes:
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a NS16550A
ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
<garbage>
But intererstingly, on identical boxes, the garbage only appears on
those hooked up to a PortMaster device - those using a Cyclades never
display this problem. (???)
Phil
next prev parent reply other threads:[~2005-03-26 15:55 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-25 20:24 Garbage on serial console after serial driver loads Luca
2005-03-25 20:38 ` Russell King
2005-03-25 21:01 ` Luca
2005-03-26 10:16 ` Jan Engelhardt
2005-03-26 14:35 ` Luca
2005-03-26 15:10 ` Russell King
2005-03-26 15:55 ` Phil Oester [this message]
2005-03-26 16:37 ` Russell King
2005-03-26 17:19 ` Phil Oester
2005-03-26 17:22 ` Phil Oester
2005-04-13 12:45 ` Paul Slootman
2005-04-18 20:21 ` Phil Oester
2005-04-18 23:14 ` David Woodhouse
-- strict thread matches above, loose matches on Subject: below --
2005-03-27 11:11 Jan Engelhardt
2005-03-28 17:36 Phil Oester
2005-03-28 19:02 ` Russell King
2005-03-28 23:57 ` Dave Airlie
2005-05-03 14:17 ` David Woodhouse
2005-05-03 15:04 ` Phil Oester
2005-05-03 15:11 ` Tom Rini
2005-05-03 15:23 ` David Woodhouse
2005-05-03 16:00 ` Tom Rini
2005-05-03 16:16 ` Tom Rini
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=20050326155549.GA5881@linuxace.com \
--to=kernel@linuxace.com \
--cc=jengelh@linux01.gwdg.de \
--cc=kronos@kronoz.cjb.net \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
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