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Date: Wed, 20 Apr 2005 10:46:58 -0700
From: "Mark A. Greer" <mgreer@mvista.com>
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To: Sam Song <samlinuxppc@yahoo.com.cn>
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Cc: linuxppc-embedded@ozlabs.org
Subject: Re: 824x Sandpoint with 2.6.x
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Sam Song wrote:

>"Mark A. Greer" <mgreer@mvista.com> wrote:
>  
>
>>>Kernel command line:
>>>console=uart,mmio,0xfdfce500,115200n8
>>>console=ttyS0,115200
>>>root=/dev/ram rw ramdisk_size=200000
>>>ip=192.168.0.3:192.168..2:::sandpoint:et
>>>h0:off panic=1
>>>
>>>      
>>>
>><snip>
>>
>>Get rid of the
>>"console=uart,mmio,0xfdfce500,115200n8" part of the
>>cmdline and see what happens (keep the
>>"console=ttyS0,115200" part).
>>    
>>
>
>If so, kernel will hang after loading the kernel......
>

Okay, obviously something is wrong. Adding another console line isn't
fixing anything, its just allowing you to flounder on a little further.
IMHO, adding another console line isn't going to help and will only add
confusion.

>I cannot see any active info.Is early console output 
>message not enough to find out something useful? 
>  
>

Sure it does. You have to enable it, then add some progress lines to
help narrow down where you're panic'ing/hanging. You can even use the
progress facility to dump the __log_buf.

I'm taking your unwillingness to use a jtag/cops debugger as indication
that you don't have such a tool!?!?

Mark