Re: MVL Linux on MPC8560 Booting goes into infinite loop inearly_init memset_io ( )

From: "Deepak Gaur" <dgaur@cdotd.ernet.in>
To: "David Baird" <dhbaird@gmail.com>, linuxppc-embedded@ozlabs.org
Subject: Re: MVL Linux on MPC8560 Booting goes into infinite loop inearly_init memset_io ( )
Date: Tue, 8 Apr 2008 17:45:52 +0630	[thread overview]
Message-ID: <20080408110411.M21892@cdotd.ernet.in> (raw)
In-Reply-To: <440abda90804071250v60bd970fh938e9690836ab61@mail.gmail.com>

Hi,

Thanks for valuable inputs.. memset_io() issue got resolved after I invalidated the L1
data and Instruction cache before calling early_init(was mentioned in some mailing list
). The code execution resumed and somewhere during MMU_init it again got struck.This
time its due to a DataTLBError. I am now trying to trace the function causing TLB miss
using ICE Trace32. Any pointers for reason behind generation of DataTLBError during MMU_init

Thanks  

Deepak Gaur
On Mon, 7 Apr 2008 13:50:04 -0600, David Baird wrote
> On Mon, Apr 7, 2008 at 10:04 AM, Scott Wood <scottwood@freescale.com> wrote:
> >  BTW, it's generally bad form to post the same question repeatedly.  If you
> > have new information regarding your problem, just post a followup in the
> > same thread containing the new information.
> 
> Agreed!  I was about to respond to your new post, and then I
> discovered this nearly identical slightly older post.
> 
> On Mon, Apr 7, 2008 at 12:37 AM, Deepak Gaur <gaur.deepak@gmail.com> wrote:
> > While booting MVL linux on MPC8560 based board the kernel goes into a
> > infinite loop in setup.c
> 
> Someone please correct me if I am wrong, but those symbols inside the
> BSS should only be variables (not functions....) which are initialized
> to zero.  The whole reason for BSS is to initialize variables to a
> 0/null value.
> 
> Now, about the infinite loop.  Can you check to see if perhaps you are
> getting an exception?
> 
> I have no experience with the MPC8560, but I've seen a couple problems
> that occur involving memset_io.  What happens is that a TLB miss
> exception occurs when the CPU gets inside of memset_io.  Do you have
> the ability to check that with a debugger (by setting breakpoints at
> exceptions, such as the data and instruction TLB miss exceptions) to
> see if you are getting exceptions?
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded

Deepak Gaur