Lpc2000

--- In lpc2000@yahoogroups.com, "rtstofer" <rstofer@...> wrote:
> > Don't know how to use your complex utility.   I only need to know
> > if JTAG is default as OFF for LPC2103.  Following is the few 
> > DWORDS from bootloader (Cut and paste from hyperterminal, pls
> > use any C-compiler to generate to Bin if needed):
> 
> The way I read the User Manual (Section 19.7) seems to agree with
> every other piece of information I have read re: CRP and JTAG.  By
> default, JTAG is enabled.  If CRP is enabled, JTAG is disabled by 
> the boot code at startup.
> 
> According to Philips, this occurs in the first few instructions 
> while it may take many instructions for JTAG to get control.  So,
> by the time JTAG can stop the processor, it is already disabled. 
> That's the theory and there isn't one single shred of PROOF that 
> it doesn't work exactly that way.  NOBODY has EVER posted PROOF 
> that the protected code can be accessed.  PROOF as in "here's the
> code, test it yourself"
> or "here's the procedure using this specific JTAG device and this
> specific piece of software".  Something that can be duplicated by
> anyone so inclined.  Everything that has been posted is just wild
> speculation and innuendo.
> 
> But, hey, if you are unconvinced, and given that you have just
> jumped from one processor to another, take this opportunity to
> change manufacturers.  There are many...  Maybe some have a better 
> way to do CRP, maybe not.
> 
> Richard
>

Hi, Completely agree with you those chips' CRP are robust and
cannot be hacked. And I never claim or seen any proven way that
chips' CRP can be bypassed.
 
I'm only curious to find out if the JTAG is default as Enabled 
for the ROM based LPC2103.  (Since bootloader is on ROM and they
can default the JTAG to OFF).  Is that OK for you??
Regards