RE: Coldfire FLASH security - how to unlock using backdoor keys?

Hi Mark,

I have some code to play with the flash registers to enable and disable
security.  The project is a CodeWarrior project.  I did it on the
MCF5213 a year or so ago so it isn't fresh in my head but I think in
order to have to MCU to work in the new configuration you have to reset
the device as during reset the core reads those Flash registers to
determine the mode of operation (i.e. core is not continuously sampling
those register and the mode of operation is determined only at reset).

I'm on the road currently and will dust off the project to validate it
is still working and try to post it here and on the FSL Forum by end of
week.

Regards, 

David 

 

David E Seymour

________________________________

From: [email protected] [mailto:[email protected]]
On Behalf Of Mark Butcher
Sent: Monday, March 17, 2008 6:49 PM
To: Seymour David
Subject: [ColdFire] Coldfire FLASH security - how to unlock using
backdoor keys?

 

Hi All

 

I have a problem trying to unlock secured FLASH in a M5223X. It is
probably the same technique for all Coldfire devices so I am wondering
whether there is a Guru in the list who can give some advice?

 

Please see the following which I have posted on the Freescale forum:

 

http://forums.freescale.com/freescale/board/message?board.id=CFCOMM&thre
ad.id=4137

 

 

Thanks

 

Regards

 

Mark

 

 

 

 

Mark Butcher Bsc (Hons) MPhil MIEE

 

M.J.Butcher Consulting                

Obere Bahnhofstr. 13,  CH-5507 Mellingen,

Switzerland         www.mjbc.ch <http://www.mjbc.ch/>  / www.uTasker.com
<http://www.utasker.com/> 

056 491 48 10 / 079 402 26 37 / Skype: M_J_Butcher

<http://www.uTasker.com>  

 

 

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