From: Matt Porter <mporter@mvista.com>
To: Greg Griffes <ggg@ieee.org>
Cc: linuxppc-embedded@lists.linuxppc.org
Subject: Re: 7400 mmu_init problem
Date: Fri, 5 Apr 2002 10:28:54 -0700 [thread overview]
Message-ID: <20020405102854.A15453@home.com> (raw)
In-Reply-To: <00e101c1dc8e$f4f8d720$6401a8c0@attbi.com>; from ggg@ieee.org on Fri, Apr 05, 2002 at 05:45:08AM -0500
On Fri, Apr 05, 2002 at 05:45:08AM -0500, Greg Griffes wrote:
>
> Hello,
>
> I am trying to port linuxppc_2_4_devel to a custom 750 design.
> Using the GNU binutils and gcc-core-2.95.3 tools.
7400 (subject line) or 750? :) It doesn't matter though.
> After ppc_md.progress reports "MMU: exit" in mm/init.c::mmu_init()
> the kernel goes into panic() and dies there.
>
> I have been using a lousy, unreliable JTAG debugger. Today, I have a
> BDI2000 and will be learning how to use it and GDB :-))
Even with a bad debugger you should be able to dump log_buf to
see the oops message.
> Has anyone experienced this in the past?
If I had a nickel for every time...
> Does anyone have a rough idea of the cause of the problem?
> My guess is that it could be many possible problems, but, it has to
> be something that I did wrong in <my>_setup.c I haven't changed
> much in the kernel itself.
We can only guess since we don't know your hardware and can't see
your board specific code. However, you made it out of MMU_init
and most likely got to start_kernel:setup_arch. I can only guess
that you access an unmapped area in your <board>_setup_arch.
> The low level IO is mapped at 0xEC00_0000; could that be a problem?
What low level IO? Are you attempting to map and use it early on?
We need more details to help further.
> The kernel is configured very slim, could I be excluding necessary
> functionality?
Not really.
Regards,
--
Matt Porter
MontaVista Software, Inc.
mporter@mvista.com
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2002-04-05 17:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-05 10:45 7400 mmu_init problem Greg Griffes
2002-04-05 17:28 ` Matt Porter [this message]
2002-04-07 0:47 ` Greg Griffes
2002-04-07 4:53 ` Matt Porter
2002-04-07 8:08 ` Wolfgang Denk
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