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Date: Tue, 20 Jan 2009 11:51:05 -0600
From: Scott Wood <scottwood@freescale.com>
To: Jean-Michel Hautbois <jhautbois@gmail.com>
Subject: Re: [MPC8272ADS]Cannot start my Linux Kernel
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On Tue, Jan 20, 2009 at 05:27:09PM +0100, Jean-Michel Hautbois wrote:
> 2009/1/20 Jean-Michel Hautbois <jhautbois@gmail.com>:
> > OK, I just tried a cuImage and a ramdisk without a FDT. I am starting
> > to boot, but it freezes.
> [...]
> > Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
> > Kernel command line: root=/dev/ram rw
> > PID hash table entries: 256 (order: 8, 1024 bytes)
> > time_init: decrementer frequency = 25.000000 MHz
> > time_init: processor frequency   = 400.000000 MHz
> > clocksource: timebase mult[a000000] shift[22] registered
> > clockevent: decrementer mult[666] sh�
> >
> 
> Having a look at the arch/powerpc/kernel/time.c file, where I am
> getting halted, it seems that the kernel reads the CPU frequency. Here
> is my question: My board has an OSC that is 100MHz (and not 400MHz !).
> I think this could be my explanation, but I can't see how I could
> solve this problem...

A multiplier is applied to the crystal to get the CPU's internal
frequency.  Try printing out what the kernel thinks the BRG frequency is.

-Scott