Re: [Ltib] Puzzle: Booting hangs after tranferring from U-boot to Kernel

[Kurt Mahan]

Mike has moved this to the Freescale Coldfire Forums.

--Kurt

Qin, Laigui (GE EntSol, Security) wrote:
> Hi Kurt,
>
> As you suggested, I step into the head.S with the debugger. The head.S
> gets hit, so does the cf_early_init(), even the start_kernel() is hit.
> However, everytime executing the printk(), no output from the console.
> Do you know what is going wrong?
>
>
> Mike Qin
>
>
> -----Original Message-----
> From: Kurt Mahan [mailto:address@hidden 
> Sent: Tuesday, June 03, 2008 12:15 AM
> To: Qin, Laigui (GE EntSol, Security)
> Cc: Stuart Hughes; address@hidden
> Subject: Re: [Ltib] Puzzle: Booting hangs after tranferring from U-boot
> to Kernel
>
> Hi Mike
>
> Qin, Laigui (GE EntSol, Security) wrote:
>   
>> Hi Kurt,
>>
>> Thanks for the pointing. My final goal is to build the Linux kernel 
>> with Ltib, so I posted it here at the beginning..
>>
>> Yes, I finally found this message in the cf_early_init(). The problem 
>> is that current booting hangs before this message... I think the Uboot
>>     
>
>   
>> parameter transferring maybe a cause. I have made a post in Uboot 
>> maillist and waiting for reponse...
>>
>> I have a Greenhill BDM degugger on hand, but since the source code is 
>> maintained by Makefile, I can only trace the steps in assembly :-(..
>>   
>>     
> Well -- one of the first things to do is to figure out if you are
> executing the kernel code after the handoff from uboot.  I would put a
> halt instruction in linux/arch/m68k/coldfire/head.S and then see if it
> gets hit.  And then step through head.S with the debugger.
>   
>> For the clock, you mean the external RTC? The memory map is a little 
>> different, I handled the difference in Uboot, but in Ltib, I am not 
>> sure where the change should happen and how. Can you give me a guide?
>>   
>>     
> I meant the processor clock rate -- if you change that you need to
> change some params in the kernel config file.
>
> --Kurt
>   
>> Thanks,
>> Mike Qin
>>
>> -----Original Message-----
>> From: Kurt Mahan [mailto:address@hidden
>> Sent: Monday, June 02, 2008 11:29 PM
>> To: Stuart Hughes
>> Cc: Qin, Laigui (GE EntSol, Security); address@hidden
>> Subject: Re: [Ltib] Puzzle: Booting hangs after tranferring from 
>> U-boot to Kernel
>>
>> Hi Mike,
>>
>> You probably want to ask in the Freescale Coldfire Forums.  I monitor 
>> it and answer questions about the M5445x BSP there.
>>        http://forums.freescale.com/freescale/board?board.id=CFCOMM
>>
>> The/ "Bumping USB Priority"/ message is emitted from the kernel very 
>> early on to indicate that the memory crossbar switch is being 
>> reprogrammed to give USB the highest access priority to the memory
>>     
> bus.
>   
>> This is needed to address an issue with usb disconnects in certain 
>> situations.
>>
>> As for your issues with transferring control to the kernel.  It could 
>> be a number of things.  Do you have a debugger that you can attach to 
>> your board?
>>
>> Also -- is your hardware clock/memory map/etc the same as the
>>     
> M54455EVB?
>   
>> --Kurt
>>
>> Stuart Hughes wrote:
>>   
>>     
>>> Hi Mike,
>>>
>>> It could be many things.  Check for instance that you have the right 
>>> tty type and also baud rate set.
>>>
>>> Your best bet would be to try the linuxppc mailing list as this looks
>>>       
>
>   
>>> like a kernel/setup problem.
>>>
>>> Regards, Stuart
>>>
>>> On Mon, 2008-06-02 at 14:38 +0530, Qin, Laigui (GE EntSol, Security)
>>> wrote:
>>>     
>>>       
>>>> Hi all,
>>>>
>>>> I have successfully porting U-boot for my custom board. Now, I am 
>>>> trying to boot the uImage built from the Ltib for M54454EVB (I plan 
>>>> to modify Ltib based on the M54454EVB, while I am not using its 
>>>> Uboot
>>>>       
>>>>         
>>   
>>     
>>>> in Ltib). The booting hangs after tranferring from U-boot to Linux 
>>>> Kernel. Any one can help on this?
>>>>
>>>>
>>>>         
> ---------------------------------------------------------------------
>   
>>>> /baudrate    = 115200 bps/
>>>> /No initrd/
>>>> /## Transferring control to Linux (at address 40020000) ../ */(HANGS
>>>> HERE)/*
>>>> --------------------------------------------------------------------
>>>> -
>>>>
>>>> And anyone knows the "Bumping USB Priority"? This come before the 
>>>> "Linux version 2.6.23..." in M54454EVB booting...
>>>>
>>>>
>>>>         
> ---------------------------------------------------------------------
>   
>>>> /   Verifying Checksum ... OK/
>>>> /OK/
>>>> /Bumping USB Priority/
>>>> /Linux version 2.6.23 (address@hidden) (gcc version 4.2.0 20070318
>>>> (prerelease) (Sourcery G++ Lite 4.2-35)) #2 Wed May 21 06:59:31 PDT 
>>>> 2008/
>>>>
>>>> --------------------------------------------------------------------
>>>> -
>>>>
>>>> Thanks,
>>>>
>>>> *Mike Qin*
>>>>
>>>>
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>>>>
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>>>>     
>>>>       
>>>>         
>>> ---------------------------------------------------------------------
>>> -
>>> --
>>>
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>>>
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>>>   
>>>     
>>>       
>>   
>>     
>
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