Re: Kernel errors at very early stage

[Xianghua Xiao <xiaoxianghua@gmail.com>]

On Wed, May 5, 2010 at 3:27 AM, Dunda, Matthias
<Matthias.Dunda@de.thalesgroup.com> wrote:
> Hi all-
>
> we've built a custom board with a FSL MPC8568EMDS CPU.
>
> U-Boot works so far - at least it is able to load a Linux kernel and a
> flattened device tree via network and launch the kernel.
>
> I get no output on the serial console from the kernel, so my only chance is
> to read out the __log_buf while in memory with my Abatron BDI 3000 debugger.
>
> The thing is, I cannot break into the code really, because it never stops
> reliable at my break points... :-(
>
> Can anyone of you see a usual suspect in the attached log?
>
> Is there something wrong with the timing, maybe? Maybe a hardware issue?
>
> How can I check this?
>
> Cheers
> Matthias
>
>
>
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from the log it seems your device tree has issue, also you may want to
turn on verbose debug, turn off preempt, turn off no_hz and see how
far it can go.

if only log_buf is available to get some output, you may want to
increase the buffer size to see more

xianghua