Re: help with inittab

[Chris Dumoulin <cdumoulin@ics-ltd.com>]

Scott, you are my saviour. The problem was in fact the IRQ setting. I 
changed the IRQ and now I get a shell, prompt, and everything. I never 
would have thought to check the UART settings, since I was getting 
output during kernel boot-up, I thought everything was good.

Thanks again,
Chris

Scott Coulter wrote:

>Chris,
>
>I was getting linux 2.6.15 running an MPC8560 board with an external
>UART.  In my board specific code that was setting up the Programmable
>Interrupt Controller (openpic), I had a problem with a loop index and
>the external interrupts were not getting setup correctly, but the
>internal interrupts were...
>
>Once I fixed the loop, there was output from the init process...
>
>What type of board are you running on?  Do you have the UART interrupt
>configured correctly (interrupt level high or low, interrupt input
>definition, etc.)?
>
>
>Scott
>
>
>
>
>
>___________________________________________________________________
>
>  Scott N. Coulter
>  Senior Software Engineer
>  
>  Cyclone Microsystems          
>  370 James Street              Phone:  203.786.5536 ext. 118
>  New Haven, CT 06513-3051      Email:  scott.coulter@cyclone.com
>  U.S.A.                        Web:    http://www.cyclone.com
>___________________________________________________________________
>
>-----Original Message-----
>From: Chris Dumoulin [mailto:cdumoulin@ics-ltd.com] 
>Sent: Friday, June 09, 2006 3:50 PM
>To: Scott Coulter
>Cc: linuxppc-embedded@ozlabs.org
>Subject: Re: help with inittab
>
>Hi Scott,
>That is where my output stops. What was the cause of your interrupt 
>problem? Were you able to fix it?
>
>- Chris
>
>Scott Coulter wrote:
>
>  
>
>>Chris,
>>
>>Does your serial output stop after "Freeing unused kernel memory..."
>>
>>If it does, you may have an interrupt problem with the UART.  I had to
>>track down that very problem the other day.  As a test, even if my UART
>>interrupt was purposely misconfigured, I still saw all of the output up
>>to and including "Freeing unused kernel memory..."
>>
>>Scott
>>
>>
>>
>>
>>___________________________________________________________________
>>
>> Scott N. Coulter
>> Senior Software Engineer
>> 
>> Cyclone Microsystems          
>> 370 James Street              Phone:  203.786.5536 ext. 118
>> New Haven, CT 06513-3051      Email:  scott.coulter@cyclone.com
>> U.S.A.                        Web:    http://www.cyclone.com
>>___________________________________________________________________
>>
>>-----Original Message-----
>>From: linuxppc-embedded-bounces+scott.coulter=cyclone.com@ozlabs.org
>>[mailto:linuxppc-embedded-bounces+scott.coulter=cyclone.com@ozlabs.org]
>>On Behalf Of Chris Dumoulin
>>Sent: Friday, June 09, 2006 3:15 PM
>>To: Steve Iribarne (GMail)
>>Cc: linuxppc-embedded@ozlabs.org
>>Subject: Re: help with inittab
>>
>>The init is from Busybox. Since I'm getting output from my serial port 
>>during the kernel boot process, I think it's safe to say that my 
>>/dev/ttyS0 is properly configured. Besides passing the kernel argument 
>>console=ttyS0,57600, is there anything else I need to do to properly 
>>configure the console? I've looked through my kernel configuration to 
>>make sure that any serial device or console related stuff was enabled 
>>and configured.
>>
>>I'm feeling pretty stumped.
>>
>>- Chris
>>
>>Steve Iribarne (GMail) wrote:
>>
>> 
>>
>>    
>>
>>>On 6/9/06, Chris Dumoulin <cdumoulin@ics-ltd.com> wrote:
>>>
>>>   
>>>
>>>      
>>>
>>>>I've now determined that my kernel seems to stop in the following
>>>>     
>>>>
>>>>        
>>>>
>>line
>> 
>>
>>    
>>
>>>>of code, in the function init(void * unused), in init/main.c:
>>>>run_init_process("/sbin/init");
>>>>     
>>>>
>>>>        
>>>>
>>>Who's init are  you using??
>>>
>>>Are you using Busyboxes or sysinit from GNU?
>>>
>>>
>>>   
>>>
>>>      
>>>
>>>>I've determined that it stops at this call by stepping through the
>>>>     
>>>>
>>>>        
>>>>
>>code
>> 
>>
>>    
>>
>>>>with a BDI2000.
>>>>
>>>>My boot arguments are:
>>>>console=ttyS0,57600n8 ip=off root=/dev/ram0 rw
>>>>
>>>>My current inittab is:
>>>>::sysinit:/etc/rc.sh
>>>>::ctrlaltdel:/sbin/reboot
>>>>::shutdown:/sbin/swapoff -a
>>>>::shutdown:/bin/umount -a -r
>>>>::restart:/sbin/init
>>>>::respawn:/bin/sh
>>>>
>>>>I've tried adding an "echo" command to the /etc/rc.sh script that is
>>>>called, but I don't see any output. I've also trying changing the
>>>>::sysinit line in inittab to point to some non-existent script, to
>>>>     
>>>>
>>>>        
>>>>
>>see
>> 
>>
>>    
>>
>>>>if I'll get some error message, but I still see nothing. Is it
>>>>     
>>>>
>>>>        
>>>>
>>possible
>> 
>>
>>    
>>
>>>>that /sbin/init is dying before it gets to the point of reading
>>>>     
>>>>
>>>>        
>>>>
>>inittab?
>> 
>>
>>    
>>
>>>>Any ideas?
>>>>
>>>>Regards,
>>>>Chris Dumoulin
>>>>
>>>>
>>>>Wolfgang Denk wrote:
>>>>
>>>>     
>>>>
>>>>        
>>>>
>>>>>In message <44888B92.40409@ics-ltd.com> you wrote:
>>>>>
>>>>>
>>>>>       
>>>>>
>>>>>          
>>>>>
>>>>>>I am using the linux kernel 2.6.15 and initrd ramdisk image from
>>>>>>         
>>>>>>
>>>>>>            
>>>>>>
>>ELDK
>> 
>>
>>    
>>
>>>>>>4.0. Currently, I seem to be able to boot without errors, but after
>>>>>>         
>>>>>>
>>>>>>            
>>>>>>
>> 
>>
>>    
>>
>>>>the
>>>>     
>>>>
>>>>        
>>>>
>>>>>>root filesystem is mounted, things just stop.
>>>>>>
>>>>>>
>>>>>>         
>>>>>>
>>>>>>            
>>>>>>
>>>>>And  what's  your  console  device?  Are  you  passing  any
>>>>>       
>>>>>
>>>>>          
>>>>>
>>console=
>> 
>>
>>    
>>
>>>>>arguments  on  the  command  line?  Is the corresponding device
>>>>>       
>>>>>
>>>>>          
>>>>>
>>entry
>> 
>>
>>    
>>
>>>>>present in the /dev/directory?
>>>>>
>>>>>Best regards,
>>>>>
>>>>>Wolfgang Denk
>>>>>
>>>>>
>>>>>
>>>>>       
>>>>>
>>>>>          
>>>>>
>>>>-- 
>>>>*--Christopher Dumoulin--*
>>>>Software Team Leader
>>>>
>>>><http://ics-ltd.com/>
>>>><http://ics-ltd.com/>
>>>>
>>>>Interactive Circuits and Systems Ltd.
>>>>5430 Canotek Road
>>>>Ottawa, ON
>>>>K1J 9G2
>>>>(613)749-9241
>>>>1-800-267-9794 (USA only)
>>>>
>>>>
>>>>     
>>>>
>>>>        
>>>>
>>-----------------------------------------------------------------------
>>    
>>
>-
>  
>
>> 
>>
>>    
>>
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>> 
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>>    
>>
>
>
>  
>


-- 
*--Christopher Dumoulin--*
Software Team Leader

<http://ics-ltd.com/>
<http://ics-ltd.com/>

Interactive Circuits and Systems Ltd.
5430 Canotek Road
Ottawa, ON
K1J 9G2
(613)749-9241
1-800-267-9794 (USA only)

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