----Original Message----
From: l...
[mailto:l...] On Behalf Of Paul Curtis
Sent: 10 December 2010 15:53 To: l...
Subject: RE: [lpc2000] Bootloader problems on LPC175x

> Hi Tim,
>
> > Umm, I still can't get it to power up without going
> > into the boot rom.
> >
> > I have changed memory_map and flash_placement.xml to
> > relocate the user code at 0x2000, but I am not sure I
> > have done it right.
>
> You do have two projects, one for the app, and one for
> the bootloader?

Errr....

No, I was trying to do it all in one project - now that you come to mention it, I can see how this would be a bad idea...
--
Tim Mitchell
t...@sabretechnology.co.uk ~ http://www.sabretechnology.co.uk
Sabre Technology (Hull) Ltd, 3a Newlands Science Park, Hull
HU6 7TQ Registered in England and Wales no.3131504
t:01482 801003 f:01482 801078
Start a New Thread

The ISP bootloader validates the vector checksum from vector words 0..0x20. The checksum word itself is placed at 0x24. Your bootloader really needs its own flash sector to allow separation from your application code. A separate sector means you don't need to be concerned with saving/restoring the bootloader itself when you re-flash your application. Your bootloader can perform the same validation the ISP does (reinvoke ISP if checksum fail), or at least check for FFFF's at the target address to make certain it doesn't vector off into a blank sector.
----- Original Message -----
From: Tim Mitchell
To: l...
Sent: Friday, December 10, 2010 8:01 AM
Subject: RE: [lpc2000] Bootloader problems on LPC175x

----Original Message----
From: l...
[mailto:l...] On Behalf Of Paul Curtis
Sent: 10 December 2010 15:53 To: l...
Subject: RE: [lpc2000] Bootloader problems on LPC175x

> Hi Tim,
>
> > Umm, I still can't get it to power up without going
> > into the boot rom.
> >
> > I have changed memory_map and flash_placement.xml to
> > relocate the user code at 0x2000, but I am not sure I
> > have done it right.
>
> You do have two projects, one for the app, and one for
> the bootloader?

Errr....

No, I was trying to do it all in one project - now that you come to mention it, I can see how this would be a bad idea...

--
Tim Mitchell
t...@sabretechnology.co.uk ~ http://www.sabretechnology.co.uk
Sabre Technology (Hull) Ltd, 3a Newlands Science Park, Hull
HU6 7TQ Registered in England and Wales no.3131504
t:01482 801003 f:01482 801078 Start a New Thread