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

[Kurt Mahan]

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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>
>