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Lpc2000

Index last updated: 2026-04-28 23:31 UTC

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Re: My own boot loader! (Or others with some help ;-)

2005-12-15 by kibobo59

Thanks for these informations.
I make my own JTAG tool, so JTAG IDENT can be discard.
 
> Warning regarding your JTAG method:
> 
> According to Philips, JTAG may not work if boot sector is corrupted. 
> I looked at the the boot sector code, and the only thing that it does
> on reset that is out of the ordinary is the following:
> 
> 	// setup part ident
> 	FMDEV[0] = 0xfff0ff22;
> 
> 	// lock flash sectors
> 	FMDEV[9] = 0xffffffff;
> 
> I suspect if you dont setup part ident, then JTAG will not work, or
> will not return the correct word for IDENT command and your JTAG
> tools may refuse to talk to the part without a proper IDENT.
> 
> Good luck!
> 
> --- In lpc2000@yahoogroups.com, "kibobo59" <c45p3r@f...> wrote:
> > I have disassembled this file:
> > bootloader_update_ver_1_52_LPC_2104_2105_2106.hex
> > 
> > within lpc2000_bl_update.zip.
> > 
> > And I want to load in RAM (through JTAG) the code able to write in the
> > last sector.
>

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