RE: Access denied

"Dobbin Allan" <[email protected]> Fri, 14 Nov 2008 08:00:55 -0700
Newsgroups gmane.comp.hardware.motorola.microcontrollers
Message-ID <4147ED8B92A864498825C07E53594E4A03DA0F03@az33exm20.fsl.freescale.net>
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Reset configuration comes from block 0 shadow flash - if certain bits in th=
e shadow reset config word is programmed to 0, BDM can be locked out.  To g=
et the part back, drive RSTCONF LOW to override the shadow config.  The res=
et config is now sampled from the data bus and chances are that is all you =
will have to do.  If you have certain DATA pins held low, you may have to p=
ull those up.  Its been a while since I worked on that part and I can't rem=
ember exactly what the relevant bits are, but this is likely enough to get =
you by.
=20
Assuming BDM now works, erase the shadow and you should be able to use the =
part again as normal.
=20
- Allan

________________________________

From: [email protected] [mailto:[email protected]] On Behalf Of J=
ean-Christophe MATHAE
Sent: Friday, November 14, 2008 4:38 AM
To: [email protected]
Subject: [MPC500] Access denied



Hello,

While trying to use the General Market CMF Driver for MPC555, I think that =
I have turned a MPC555 chip into a useless bit of silicon...

Is this possible? Could a wrong shadow information in Flash make the chip u=
nresponsive to the BDM?

Best regards.

Jean-Christophe MATHAE

CIRTEM
http://www.cirtem.com <http://www.cirtem.com>=20

b=E2timent Pointe Bleue
20, voie l'Occitane
BP661
31319 LABEGE cedex
France



=20


[Non-text portions of this message have been removed]


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            <p>Reset configuration comes from block 0 shadow flash - if cer=
tain bits in the shadow reset config word is programmed to 0, BDM can be lo=
cked out.  To get the part back, drive RSTCONF LOW to override the shadow c=
onfig.  The reset config is now sampled from the data bus and chances are t=
hat is all you will have to do.  If you have certain DATA pins held low, yo=
u may have to pull those up.  Its been a while since I worked on that part =
and I can't remember exactly what the relevant bits are, but this is likely=
 enough to get you by.<br>
 <br>
Assuming BDM now works, erase the shadow and you should be able to use the =
part again as normal.<br>
 <br>
- Allan<br>
<br>
____________<wbr>_________<wbr>_________<wbr>__<br>
<br>
From: <a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>c=
om</a> [mailto:<a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogrou=
ps.<wbr>com</a>] On Behalf Of Jean-Christophe MATHAE<br>
Sent: Friday, November 14, 2008 4:38 AM<br>
To: <a href=3D"mailto:MPC500%40yahoogroups.com">MPC500@yahoogroups.<wbr>com=
</a><br>
Subject: [MPC500] Access denied<br>
<br>
Hello,<br>
<br>
While trying to use the General Market CMF Driver for MPC555, I think that =
I have turned a MPC555 chip into a useless bit of silicon...<br>
<br>
Is this possible? Could a wrong shadow information in Flash make the chip u=
nresponsive to the BDM?<br>
<br>
Best regards.<br>
<br>
Jean-Christophe MATHAE<br>
<br>
CIRTEM<br>
<a href=3D"http://www.cirtem.com">http://www.cirtem.<wbr>com</a> &lt;<a hre=
f=3D"http://www.cirtem.com">http://www.cirtem.<wbr>com</a>&gt; <br>
<br>
b=E2timent Pointe Bleue<br>
20, voie l'Occitane<br>
BP661<br>
31319 LABEGE cedex<br>
France<br>
<br>
[Non-text portions of this message have been removed]<br>
<br>
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