m8xx hang in reboot (fwd)

[VanBaren, Gerald (AGRE)]

OK, I'll add my guess :-).  Do you have the address IMAP_ADDR cached (which would be a Very Bad Thing!)?  If so, you sometimes would read the cached value (no machine check) rather than the physical value (machine check -> reset).

gvb


> -----Original Message-----
> From: owner-linuxppc-embedded at lists.linuxppc.org
> [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf
> Of Mark S.
> Mathews
> Sent: Wednesday, August 25, 2004 5:26 PM
> To: linuxppc-embedded
> Subject: Re: m8xx hang in reboot (fwd)
>
>
>
> The saga continues...  ;-)
>
> I added code to explicitly clear the CHSTPE bit in the DER register.
> Didn't make any difference.
>
> I'm stumped.
>
> -M
>
> On Wed, 25 Aug 2004, Mark S. Mathews wrote:
>
> >
> > A little more info.  The hang occurs on this line:
> >
> > 	dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0];
> >
> > Which is _supposed_ to generate a machine check I believe.
> >
> > So I guess my next step is to see if somehow the DER got
> set and we're
> > popping into debug mode instead of resetting...
> >
> > -M
> >
> > --
> >
> > Mark S. Mathews
> >
> > AbsoluteValue Systems      Web:    http://www.linux-wlan.com
> > 721-D North Drive          e-mail: mark at linux-wlan.com
> > Melbourne, FL 32934        Phone:  321.259.0737
> > USA                        Fax:    321.259.0286
> >
> > ---------- Forwarded message ----------
> > Date: Wed, 25 Aug 2004 16:22:00 -0400 (EDT)
> > From: Mark S. Mathews <mark at linux-wlan.com>
> > To: linuxppc-embedded <linuxppc-embedded at lists.linuxppc.org>
> > Subject: m8xx hang in reboot
> >
> > Hey Folks,
> >
> > I've got an mpc850 based setup running 2.4.27 that, under certain
> > circumstances, hangs in the the m8xx_restart() function (instead of
> > rebooting)
> > when I issue the usermode reboot cmd.
> >
> > I've traced all through the path and confirmed that yes, it
> is hanging in
> > this
> > function.  ;-)
> >
> > I'm still looking over the databook and what this code
> does.  Just figured
> > I'd
> > ask around and see if anyone else has seen this behavior.
> >
> > Thanks,
> > -Mark
> >
> > --
> >
> > Mark S. Mathews
> >
> > AbsoluteValue Systems      Web:    http://www.linux-wlan.com
> > 721-D North Drive          e-mail: mark at linux-wlan.com
> > Melbourne, FL 32934        Phone:  321.259.0737
> > USA                        Fax:    321.259.0286
> >
> >
> >
>
> --
>
> Mark S. Mathews
>
> AbsoluteValue Systems      Web:    http://www.linux-wlan.com
> 721-D North Drive          e-mail: mark at linux-wlan.com
> Melbourne, FL 32934        Phone:  321.259.0737
> USA                        Fax:    321.259.0286
>


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/