From: Vitaly Bordug <vbordug@ru•mvista.com>
To: KokHow Teh <KokHow.Teh@marconi•com>
Cc: david.jander@protonic•nl,
linuxppc-embedded list <linuxppc-embedded@ozlabs•org>
Subject: Re: serial console
Date: Wed, 05 Oct 2005 16:23:39 +0400 [thread overview]
Message-ID: <4343C5CB.2040006@ru.mvista.com> (raw)
In-Reply-To: <OF0BB1D8FC.27908478-ON48257091.000E28F8@uk.marconicomms.com>
KokHow Teh wrote:
> Hi;
> I have tried with 4 types of command lines with my linux kernel with
> devfs and serial device compiled in and none gives me the desired results:
>
> (1) console=tts/0,115200n8 OR console=ttyCPM0,115200n8
>
> no serial console output at all during boot time but it gives me
> login prompt at the end.
>
> (2) without "console=" OR console=ttyS0,115200n8
>
> serial console output fine during bootup but only until the point
> when it prints out "Freeing unused kernel memory: 232k init 4k prep". After
> that, the serial console output is garbled. No login prompt.
>
> So this has not solved my problem. I need more advice. Here are some
> more questions and observations:
>
> (1) David Jander's comment:
>
> I don't know exactly what I am talking about right now, but the string
> "tts/0"
> in the console-line sounds suspicious to me. AFAIK when using devfs still
> device names on the kernel-commandline have to be old-style.
> Just a guess: try using "console=ttyS0,115200n8" and see if this helps.
>
> Is it confirmed that kernel-commandline has to be old-style even
> though the kernel is using devfs?
>
> (2) Vitaly Bordug's suggestion of using "console=ttyCPM0". May I know
> where is ttyCPM0 defined and how is it bound to the serial console device
> driver in the source?
>
Ummm.. The driver itself is in drivers/serial/cpm_uart. It does have the
different major than ordinary ttyS... This relates to the 2.6.x kernel
of course. I could suggest you to try the latest kernel.org release, in
which you board is known to work fine.
> Thanks for any input and pointer.
>
> Regards,
> TEH
>
>
>
--
Sincerely,
Vitaly
next prev parent reply other threads:[~2005-10-05 12:23 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-05 2:36 serial console KokHow Teh
2005-10-05 12:23 ` Vitaly Bordug [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-10-05 2:32 KokHow Teh
2005-10-04 6:54 KokHow Teh
2005-10-04 15:11 ` David Jander
2005-10-04 15:16 ` Vitaly Bordug
2005-10-05 9:16 ` David Jander
2005-07-30 1:06 Serial console Daniel Ann
2005-07-30 1:19 ` Josh Boyer
2005-07-30 1:36 ` Daniel Ann
2005-07-30 5:46 ` Daniel Ann
2005-07-30 1:27 ` Ricardo Scop
2005-07-30 1:34 ` Daniel Ann
2005-07-30 10:37 ` Anton Wöllert
2005-08-01 1:27 ` Daniel Ann
2005-08-02 3:38 ` JohnsonCheng
2005-08-02 13:39 ` Kumar Gala
2005-08-03 0:16 ` Daniel Ann
2003-03-04 14:53 Serial Console Aman
2003-03-04 15:40 ` Mark Hatle
2003-03-04 17:06 ` Ibon Gotxi Garcia
2003-03-04 19:09 ` Dave Wolfe
2003-01-16 21:06 Aman
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