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Lpc2000

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Message

Re: Flash Security Clarification --- some sad facts

2005-12-26 by unity0724

> f)  It is a well established theory that you cannot build security
> using software alone if the there is no support for it in 
hardware. 
> Based on what I have seen so far, Philips had not included CRP 
goal in
> the hardware design, and it is just a software afterthought.
> 
> Regards,
> 
> Jaya

Current CRP implementated by Philips should be secure enough.

Please look at the CHIP from TOP-DOWN, the bigger picture:
If only programming method is through Serial Port, why using
software CRP is not safe??
- Assuming JTAG port is locked down properly, and the is no
  undocumented parallel port programming.
What is the problem of using software CRP??

The other Atmel/Pic chip are having parallel, Serial-SPI
and etc types of programming, hence they need extra CRP locking
hardware.  All these are hardware flash programming state machines.

Regards   /MH

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