From: "Jon Smirl" <jonsmirl@gmail.com>
To: "Siva Prasad" <sprasad@bivio.net>
Cc: linuxppc-dev@ozlabs.org, linuxppc-embedded@ozlabs.org
Subject: Re: Device node - How does kernel know about it
Date: Wed, 26 Dec 2007 21:55:51 -0500 [thread overview]
Message-ID: <9e4733910712261855p74a64c48pc7e89ebdd97d4a76@mail.gmail.com> (raw)
In-Reply-To: <D83235F0F3C86D4D889D8B9A0DA8C6D7012AF958@corpexc01.corp.networkrobots.com>
On 12/26/07, Siva Prasad <sprasad@bivio.net> wrote:
> Hi,
>
> I am really interested in finding out how kernel knows about device
> nodes and how the whole thing work. This is as part of my debugging
> effort on 8641D based PowerPC board.
>
> * It all started with the problem of "not printing" any thing that comes
> from ramdisk (echo and printf statements), while kernel printk's work
> perfectly fine.
> * Ramdisk is also executing fine, just that prints are not coming out of
> serial. I can see the execution of various user programs with a printk
> in sys_execve() routine. Ramdisk has all the required files like
> /dev/console, /dev/ttyS0, etc.
Does adding console=ttyS0,baud to the kernel boot command line fix it?
--
Jon Smirl
jonsmirl@gmail.com
next prev parent reply other threads:[~2007-12-27 2:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-27 1:31 Device node - How does kernel know about it Siva Prasad
2007-12-27 2:55 ` Jon Smirl [this message]
2007-12-28 8:39 ` Nicholas Mc Guire
2007-12-28 3:27 ` Siva Prasad
2007-12-28 4:15 ` Jon Smirl
2007-12-28 4:55 ` Siva Prasad
2007-12-30 23:43 ` Brad Boyer
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