* m8xx hang in reboot (fwd)
@ 2004-08-25 20:54 Mark S. Mathews
2004-08-25 21:25 ` Mark S. Mathews
0 siblings, 1 reply; 4+ messages in thread
From: Mark S. Mathews @ 2004-08-25 20:54 UTC (permalink / raw)
To: linuxppc-embedded
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@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@linux-wlan.com>
To: linuxppc-embedded <linuxppc-embedded@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@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/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: m8xx hang in reboot (fwd)
2004-08-25 20:54 m8xx hang in reboot (fwd) Mark S. Mathews
@ 2004-08-25 21:25 ` Mark S. Mathews
0 siblings, 0 replies; 4+ messages in thread
From: Mark S. Mathews @ 2004-08-25 21:25 UTC (permalink / raw)
To: linuxppc-embedded
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@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@linux-wlan.com>
> To: linuxppc-embedded <linuxppc-embedded@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@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@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/
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: m8xx hang in reboot (fwd)
@ 2004-08-26 11:51 VanBaren, Gerald (AGRE)
2004-08-26 12:46 ` Mark S. Mathews
0 siblings, 1 reply; 4+ messages in thread
From: VanBaren, Gerald (AGRE) @ 2004-08-26 11:51 UTC (permalink / raw)
To: linuxppc-embedded
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@lists.linuxppc.org
> [mailto:owner-linuxppc-embedded@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@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@linux-wlan.com>
> > To: linuxppc-embedded <linuxppc-embedded@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@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@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/
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: m8xx hang in reboot (fwd)
2004-08-26 11:51 VanBaren, Gerald (AGRE)
@ 2004-08-26 12:46 ` Mark S. Mathews
0 siblings, 0 replies; 4+ messages in thread
From: Mark S. Mathews @ 2004-08-26 12:46 UTC (permalink / raw)
To: VanBaren, Gerald (AGRE); +Cc: linuxppc-embedded
Thanks for the input, but I don't believe this is it. We're accessing a
location IMAP_ADDR+someoffset that's reserved space to generate a bus
error.
Thanks for the consideration,
-M
On Thu, 26 Aug 2004, VanBaren, Gerald (AGRE) wrote:
>
> 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@lists.linuxppc.org
>> [mailto:owner-linuxppc-embedded@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@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@linux-wlan.com>
>>> To: linuxppc-embedded <linuxppc-embedded@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@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@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@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/
^ permalink raw reply [flat|nested] 4+ messages in thread
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2004-08-25 20:54 m8xx hang in reboot (fwd) Mark S. Mathews
2004-08-25 21:25 ` Mark S. Mathews
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2004-08-26 11:51 VanBaren, Gerald (AGRE)
2004-08-26 12:46 ` Mark S. Mathews
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