Mauricio, with IAP calls you can not erase the bootloader, it protects itself as it knows where it is located. I can assure you we have an options to program the virgin device on a tester. Regards, Robert --- In lpc2000@yahoogroups.com, Mauricio Scaff <scaffm@g...> wrote: > > If the parallell programming is done by the bootloader, and the serial > programming is done by the bootloader, and the JTAG is controlled by the > bootloader, How the bootloader is programmed for the first time (in > factory ) ???? > > Another question: > Is it possible to erase the bootloader using the provided IAP calls ? If > so, is there anyway to recover it ? > > Mauricio > > > > > Robert, > > > > fyi, parallel programming is possible but the only thing parallel is > > the databus, in the end the parallel programmer again uses the > > bootloader for programming. > > > > The other Robert > > > > --- In lpc2000@yahoogroups.com, Robert Adsett <subscriptions@a...> > > wrote: > > > > > > At 01:39 AM 12/22/05 +0000, jayasooriah wrote: > > > >Was Philips misleading us about Code Read Protection? > > > > > > > >The preliminary user manual for LPC2119/2129/2194/2292/2294 dated > > 2004 > > > >May 03 in the section on CRP states: > > > > > > > > > When the code read protection is enabled the JTAG debug > > > > > port, external memory boot and the following ISP commands > > > > > are disabled: > > > > > > > > > > . Read Memory > > > > > . Write to RAM > > > > > . Go > > > > > . Copy RAM to Flash > > > > > > > > > > The ISP commands mentioned above terminate with return > > > > > code CODE_READ_PROTECTION_ENABLED. > > > > > > > > > > The ISP erase command only allows erasure of all user > > > > > sectors when the code read protection is enabled. > > > > > > > >Philips stated (by way of poster dated Sat Dec 17, 2005 11:52 AM) > > > >that the purpose of CRP as: > > > > > > > > > Code Read Protection (CRP) was implemented with intention > > > > > to protect on-chip Flash content from preying eyes. > > > > > > > >It appears that Philips made these claims while it knew that CRP > > can > > > >be defeated by other methods, including parallel programming or > > > >booting from external memory. > > > > > > > >1/ LPC parts without external memory interface support parallel > > > >programming. This method can be used to read and write on- chip > > flash. > > > > > > I've seen the hints you provided on this but no real evidence > > yet. Since > > > this appears to directly contradict what is on Philips Website I > > remain to > > > be convinced. You need to be able to show that the parts can be > > parallel > > > programmed and that method of programming bypasses the CRP > > > features. Certainly if parallel programming is possible it raises > > that as > > > a possibility since presumably the boot loader would not be > > involved. > > > > > > There is another possibility though and that is that you have been > > the > > > victim of marketing manipulation of terms. It is quite possible > > that the > > > references you have seen to parallel programming are just > > indicators that > > > the devices can be programmed off board with an appropriate > > programmer and > > > that programmer uses either the serial or JTAG ports to do the > > programming. > > > > > > > > > >2/ On LPC parts with external memory, it is possible to force the > > > >part to boot on external memory. Code in external memory can > > read and > > > >write on-chip flash. > > > > > > Well they do claim that turning on CRP disables the ability to > > boot from > > > external memory. Do you have any evidence to the contrary? This > > does have > > > the advantage of being easily tested. Have you tested it and if > > so what > > > did you use for a test case? If not, why not? With a test case > > this would > > > be easy to duplicate and verify. > > > > > > >If the above claims are not true, it would be a simple matter for > > > >Philips to say so. The fact that Philips has chosen to go quiet > > on > > > >this issue seems to suggest the claims are indeed true. > > > > > > Hey give them a bit of a chance. They do, I think, need to > > respond. If > > > this is coming out of the blue they may need some time to figure > > out > > > exactly what it is they are responding to. Also at this season > > the people > > > most able to respond may well be on vacation. > > > > > > Robert > > > > > > " 'Freedom' has no meaning of itself. There are always > > restrictions, be > > > they legal, genetic, or physical. If you don't believe me, try to > > chew a > > > radio signal. " -- Kelvin Throop, III > > > http://www.aeolusdevelopment.com/ > > > > > > > > > > > > > > > > > SPONSORED LINKS > > Microprocessor > > <http://groups.yahoo.com/gads? t=ms&k=Microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=Pic+mi crocontrollers&w4=8051+microprocessor&c=4&s=93&.sig=tsVC- J9hJ5qyXg0WPR0l6g> > > Microcontrollers > > <http://groups.yahoo.com/gads? t=ms&k=Microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3=Pic+ microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=DvJVNqC_pqRTm8X q01nxwg> > > Pic microcontrollers > > <http://groups.yahoo.com/gads? t=ms&k=Pic+microcontrollers&w1=Microprocessor&w2=Microcontrollers&w3= Pic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=TpkoX4KofDJ 7c6LyBvUqVQ> > > > > 8051 microprocessor > > <http://groups.yahoo.com/gads? t=ms&k=8051+microprocessor&w1=Microprocessor&w2=Microcontrollers&w3=P ic+microcontrollers&w4=8051+microprocessor&c=4&s=93&.sig=1Ipf1Fjfbd_H VIlekkDP-A> > > > > > > > > ----------------------------------------------------------------- ------- > > YAHOO! 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Message
Re: LPC FLASH security (CRP) broken?
2005-12-22 by philips_apps