i.MX31 Early Kernel Messages

i.MX31 Early Kernel Messages

[Russell, Richard S (G&N CoE)]

Hello,

I'm having what appears to be a common (new user) problem.  When I boot
the kernel on the Logic PD i.MX31 SOM, kernel messages stop after the
"Uncompressing Linux... done, booting the kernel." message.

I've tried numerous versions of the kernel from various git repositories
(see list** below) and I've been unsuccessful using all of them.  I've
only been successful using the kernel from the "free" TimeSys board
support package.

As best I can tell, the TimeSys kernel sets up an early console to
display the early kernel messages. Is there an equivalent feature in the
latest kernel?  If so, how does one enable it?


**I've tried the latest versions of the kernel from:
   git://git.pengutronix.de/git/imx/linux-2.6.git
   http://opensource.freescale.com/pub/scm/imx/linux-2.6-imx.git

Thanks,
Richard 

i.MX31 Early Kernel Messages

[Baruch Siach]

Hi Richard,

On Mon, Apr 11, 2011 at 02:48:36PM -0400, Russell, Richard S (G&N CoE) wrote:
> As best I can tell, the TimeSys kernel sets up an early console to
> display the early kernel messages. Is there an equivalent feature in the
> latest kernel?  If so, how does one enable it?

Enable the early printk option in you kernel configuration (Kernel hacking -> 
Kernel low-level debugging functions -> Early printk), and add 'earlyprintk' 
to your kernel command line parameters.

baruch

-- 
                                                     ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

i.MX31 Early Kernel Messages

[Russell, Richard S (G&N CoE)]

Thanks Baruch!  That did the trick.

Richard


-----Original Message-----
From: Baruch Siach [mailto:baruch at tkos.co.il] 
Sent: Monday, April 11, 2011 2:03 PM
To: Russell, Richard S (G&N CoE)
Cc: linux-arm-kernel at lists.infradead.org
Subject: Re: i.MX31 Early Kernel Messages

Hi Richard,

On Mon, Apr 11, 2011 at 02:48:36PM -0400, Russell, Richard S (G&N CoE)
wrote:
> As best I can tell, the TimeSys kernel sets up an early console to
> display the early kernel messages. Is there an equivalent feature in
the
> latest kernel?  If so, how does one enable it?

Enable the early printk option in you kernel configuration (Kernel
hacking -> 
Kernel low-level debugging functions -> Early printk), and add
'earlyprintk' 
to your kernel command line parameters.

baruch

-- 
                                                     ~. .~   Tk Open
Systems
=}------------------------------------------------ooO--U--Ooo-----------
-{=
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -