Booting hangs after "Calibrating delay loop..."

[Nguyen Thanh Binh]

Hi Guillaume,

I have tried with your suggestions. But I did not find
arch/ppc/syslib/m8xx_setup.c as you said, instead I
found arch/ppc/kernel/m8xx_setup.c.
I have modified as you showed me, but the result was
always the same.
It means that boot hangs after printing "Calibrating
delay loop...".

You can find what I have modified in the attached
files 
(time.c in arch/ppc/kernel, m8xx_setup.c in
arch/ppc/kernel).

Do you have any idea?

Thank you very much.

Binh Nguyen

--- "Autran, Guillaume" <gautran at mrv.com> wrote:

> Hi,
> 
> I remember there is some race condition before
> calling set_dec(..) in time.c
> Basically, what happens is that the external
> decrementer is set way before
> the interrupt gets enabled. When we get to enable
> the interrupt, the
> decrementer value already reached 0 and wrapped
> arround (at least in our
> case). 
> The fix was to comment the line in:
> arch/ppc/kernel/time.c:330:
> set_dec(tb_ticks_per_jiffy);
> 
> And move it to:
> arch/ppc/syslib/m8xx_setup.c
> inside m8xx_calibrate_decr() just before setting up
> the interrupt for the
> decrementer.
> 
> In time.c, you may also need to initialize stamp =
> get_native_tbl(); as this
> variable may not have been initialized since you are
> using an external
> decrementer.
> 
> Try that...
> 
> Guillaume.
> 


		
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