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Access denied

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	Access denied by Jean-Christophe MATHAE :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message 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 unresponsive to the BDM? Best regards. Jean-Christophe MATHAE CIRTEM http://www.cirtem.com bâtiment Pointe Bleue 20, voie l'Occitane BP661 31319 LABEGE cedex France
	RE: Access denied by Dobbin Allan-r11834 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Reset configuration comes from block 0 shadow flash - if certain bits in the shadow reset config word is programmed to 0, BDM can be locked out. To get the part back, drive RSTCONF LOW to override the shadow config. The reset 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 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. Assuming BDM now works, erase the shadow and you should be able to use the part again as normal. - Allan ________________________________ From: MPC500@... [mailto:MPC500@...] On Behalf Of Jean-Christophe MATHAE Sent: Friday, November 14, 2008 4:38 AM To: MPC500@... 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 unresponsive to the BDM? Best regards. Jean-Christophe MATHAE CIRTEM http://www.cirtem.com <http://www.cirtem.com> bâtiment Pointe Bleue 20, voie l'Occitane BP661 31319 LABEGE cedex France [Non-text portions of this message have been removed]
	RE: Access denied by Jean-Christophe MATHAE :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Alan, Thank you verify much for your help! Alas, this only confirm my fears: we left RSTCONF unconnected on our new board :-(( The old one had an external pull-up resistor to +3.3V and it would have been easy to drive it low. Next rework of this new card will include a pull-up... Best regards. Jean-Christophe MATHAE CIRTEM http://www.cirtem.com bâtiment Pointe Bleue 20, voie l'Occitane BP661 31319 LABEGE cedex France ________________________________ De : MPC500@... [mailto:MPC500@...] De la part de Dobbin Allan Envoyé : vendredi 14 novembre 2008 16:16 À : MPC500@... Objet : RE: [MPC500] Access denied Reset configuration comes from block 0 shadow flash - if certain bits in the shadow reset config word is programmed to 0, BDM can be locked out. To get the part back, drive RSTCONF LOW to override the shadow config. The reset 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 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. Assuming BDM now works, erase the shadow and you should be able to use the part again as normal. - Allan ________________________________ From: MPC500@... <mailto:MPC500%40yahoogroups.com> [mailto:MPC500@... <mailto:MPC500%40yahoogroups.com> ] On Behalf Of Jean-Christophe MATHAE Sent: Friday, November 14, 2008 4:38 AM To: MPC500@... <mailto:MPC500%40yahoogroups.com> 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 unresponsive to the BDM? Best regards. Jean-Christophe MATHAE CIRTEM http://www.cirtem.com <http://www.cirtem.com> <http://www.cirtem.com <http://www.cirtem.com> > bâtiment Pointe Bleue 20, voie l'Occitane BP661 31319 LABEGE cedex France [Non-text portions of this message have been removed]